How to find activity log with time stamps of when applications were opened and closed on MacBook Pro
The console app is in your utilities folder which is in your Applications folder. This app is for browsing thru log files. To find when an application was started open the console app and click on Mac Analytics Data on the left side of the console app. Then you can search for the name of the app you are looking for. See the image below. I started the app Preview at around 7:16 pm

This file does not give STOP time but that may be in a different log file.