Radio Pakistan says on August 18
Caretaker Minister for Information Murtaza Solangi visited the residence of former Member of National Assembly Tahira Aurangzeb in Rawalpindi and met former Minister for Information Marriyum Aurangzeb. [...]
The Caretaker Information Minister applauded Marriyum Aurangzeb for running the Information Ministry in the best manner for 16 months.
So, it seems Aurangzeb indeed no longer in the cabinet. Pakistan Today puts the transfer on August 17 though (in an article dated next day):
Minister for Information and Broadcasting Murtaza Solangi assumed charge on Thursday.
Mortaza Solangi arrived at the Ministry of Information and Broadcasting after taking oath at the President’s House.
I guess it's possible Aurangzeb resigned or was dismissed a week before though (Aug 10), but insofar I could not find confirmation.
Caretaker PM "Anwaar-ul-Haq Kakar was sworn in on Monday" (Aug 14) according to AP. The reshuffling of the cabinet was almost certainly related to that.
On Aug 9 the Parliament was dissolved. According to a CGTN report of Aug 8, the entire Shahbaz Sharif government was slated to resign the same day (Aug 9), although few other sources seems to have covered that announcement. I guess that's what's counted as Aurangzeb last day in office (on Wikipedia).