If you want to package UE5 games for Mac, you must do so on a Mac.

Windows can only package games for Windows and for Linux. It cannot package games for Mac.

What you really want to do is to use source control, like Git or Perforce (or another SCM). This makes it very easy to share the code on multiple machines.

To reduce the time it takes you personally, you could also take a look at continuous integration techniques, but those can be expensive. CI trades money for time.