The primary pro-growth policies that Donald Trump has already implemented have related to regulation.
He issued an executive order that requires that regulatory agencies eliminate one regulation for each one that they add. It's unclear if any regulations have been eliminated under this, but it is already delaying new regulations.
Trump has signed fourteen Congressional Review Act resolutions. These reversed rules issued late in the Barack Obama administration. They also have the effect of blocking future rule changes in the same area.
In general, Trump has appointed people who favor growth over other potential priorities. For example, Ben Carson believes that it is more important to break the cycle of poverty than to subsidize needs (housing, etc.). Scott Pruitt was known for fighting regulations before joining the Trump administration, and opponents say that he has had some success at rolling back regulations since.