If you watch enough news, there are a decent amount of reports of objects coming within close range of the planet (I worked in an office where Fox News was on, and they would have a story about such events every couple of months or so). With that said, they were always back end of the hour stories and would always describe the passing as near miss in teases, only to reveal in story that they were still very well outside of Earth's gravity well and are only close by the scale of size in the separation of bodies in space (the moon is still closer much closer, and that's a two day trip by best speed... and man's highest altitude is only slightly further than the moon's orbit (set by Apollo 13 and depicted in the film when the Aquarius goes radio silent while in Orbit of the moon (Tom Hank's character has a day dream sequence about his aborted lunar walk)).
In fact, the largest single area of space debris in the near solar system, the Asteroid Belt, is still so navigable that flying humans through the densest part of the region to Jupiter without any navigation controls and never see an asteroid. Yes, you must never tell Han Solo the odds, but nobody bothered to tell George Lucas the odds either (or rather, they did, he quoted it, but Lucas never understood that odds are better as they approach one. Still best Star Wars movie, fight me).
And while there are two mass extinction events associated with meteor impacts, including the Chicxulub Impact (of "What Killed the Dinosaurs fame) and the more recent "Grande Coupure" (Great Break, 33.9 million years ago), and was likely caused by the Popigai Impact, though the Chesapeake and Tom's Canyon impacts are possible causes, if not results of the same event. The Chixulub Crater is the second largest confirmed crater and caused the extinction of 75% of all species, while the "Grande Coupure" was a very minor event in terms of mass extinctions, with only Europe and Asia seeing any of the impact. Popigai Crater is the fourth largest impact crater on Earth and the percentage of species dying off is not know, and compared to the the largest five events that ever happened.
In terms of extinction events, the Largest known Extinction Event is the "Great Dying" that took place before the start of the Triassic period. The Great Dying is believed to have wiped out 95% of all life on Earth, and the cause is not fully understood. While there are impact sites from around this time, it's they are not thought to be the cause as they were too small to kill so many things. Other suggestions where releases of chemicals into the environment due to volcanism, and even the mere existence of Pangea, or a combination of events with no single cause (The event was devestating to marine life, and mass chemical release and Pangea's near uniform coast line conditions could have reduced an evolution diversity in marine life resulting in extinction across the board).
Even the largest known impact sight, Vredefort Crater, didn't result in a mass extinction. Twice the size of the one that killed the dinosaurs, Vredefort occured about 2 billion years ago. Life was simple in those days. Back then, continents were in their infancy, all the cool cells were becoming complex and breathing oxygen. A new culinary trend called Photosythesis was introduced by Cyanobacteria, and absolutely no one was having sex, ever. No wonder scientists call this period the "Boring Billion".
Suffice to say, the period was marked by a prolonged period of not a great deal of anything interesting going on... at this point in History, Vredefort was the biggest thing to hit Earth since it cleared it's orbit of the sun (4.6 billion years)! And it wasn't thought to really have greatly effected life on earth in any measurable way. In fact, the major extinction event just before this period was known as the Great Oxygen Holocaust, which nearly killed everything. At the time, life was anaerobic, meaning that their metabolism was without oxygen. In fact, good ol' clean fresh air we love to breath was toxic to most anaerobic creatures, and with it's introduction, almost everything was no poisoned and dead and rather quickly. While we have no numbers, it might have killed more than the Great Dying event. Vredefort was a nothing-burger by comparison.
There are some 40 known impact craters on earth from various points between the Boring Billion and now (well, relatively now... on a geology scale) and only the second and fourth largest of theses impacts were tied to extinction events. And only one of them ranks in the top five largest mass extinction events and it's kinda in a four way tie for second most devastating to life. In fact, of all extinction events with a known cause, 11 were caused by "Flood Basalt" events (gigantic volcanic erruptions that flood areas with Basalt and throw sun blotting dust into the atmosphere). And to stress how doomed you are if this happens, all of these events were "significant extinction events" and three of them are in the top five, including the Great Dying. That said, there are five events where the extinction was already well underway before the Flood Basalt event... so they just made a bad situation even worse.
The next most devastating cause are Ocean Falls, which are significant drops in sea level. 12 extinction events are associated with these events, of which, seven were significant, including all of big five extinctions. This is due to the fact that the oceans are vitally important to food chains and most primary producing elements, and thus, all life, are in coastal regions.
Finally, Impact Events are definitively linked to one event (you know the one) and might have played in a second, but again, it was only on significant event. In fact, if you accept the fact that there is a God or some similar entity, then he was seriously pissed off at the Dinosaurs, as he hit them with all three causes... there was a Flood Basalt during the event, an Ocean Fall, and the second largest impact event all during the K-T Extinction event. If there is an intelligence to the Universe, it most certainly wanted to make sure the Dinosaurs were dead (and it's further evidenced by the fact that the dinosaurs endured two of the top five extinction events, with Triassic-Jurassic Event being one of the top five.).
So suffice to say, an extinction by meteor is not only highly unlikely by astological odds, but also by extinction odds, There are over forty impact sites around the world spanning a period of 2.4 billion years of the existance of life on Earth, and yet at best, only two can be attributed to an extinction event... and one of those was "extinction of all primates in Europe" levels of devastating (Humans would hunt and kill all but two species of Elephants to extinction with nothing more than sticks and sharp rocks... and then we got more petty and more devastating in the number of animals we made extinct).
Extinction by Impact is the rarest form of extinction events... but is the one everyone remembers. And fact that's going to blow your mind is this: To demonstrate just how much humans have been a thing, consider the following thought experiment: Suppose we condense all of Earth's history from it's formation to the very moment I hit send on this answer to be represented as a single 24 hour day. Midnight is the moment Earth became a planet, and 11:59.99 is the exact present moment. Life would begin around 4:00 am and the oldest fossilized life would have died at 5:36 AM. The Joys of Sexual Reproduction wouldn't occur until 6:00 PM, over twelve hours after the first fossil appeared. The age of the Dinosaurs would begin at 10:00 PM, and would wrap up at 11:39 PM with the best fireworks show ever seen by a living thing on this planet and the Mammial's keep the party going from this point. The next Impact event that resulted in a extinction event would be around 11:49 PM, but nobody really noticed it, and at 11:58.43 PM, man walks into the party like he owns the place. If you want a more practical scale, if you hold your arms straight out to form a time-line of all of earth (from your left hand to right hand), the age of human history would start right about the portion of your middle finger's finger nail... about the point where you would clip it back once it grew too long).
Suffice to say, while it's great that there is some concern, it's not by any stretch the biggest problem facing and anything short of keeping an eye on the sky would require a large investment in a defense system for a threat that happened twice in 4.6 billion years.
And going back to our 24 hours of all Earth history, we can see that Jurrassic Park was right about something related paleontology. Life as we know it is a rare and precious thing in the universe... it requires very specific conditions... but the tricky thing about life isn't starting it up, it's stopping it once you got it going. It's been ongoing since 4 am to the very last second on the clock, surviving numerous attempts to eradicate life to such a degree that it was once reduce to just 4% of all species... and it was only in the last 30 seconds of the day that life said "Hey, something is going to try and kill us again! We should do something." If Jurassic Park said one paleontological correct thing, it's that "Life Finds a Way".
4.6 billion years and no force in the verse has stopped us.