Hi Gang - I got it work just fine on my M1 MacBook Air!
BTW I was able to make the patch work running in a non-standard directory by editing the RUN_PATCH_RS.command file to update the path the game is living in. This may be helpful for those of you (like me) who want to run off an external volume because our base Mac drive is too small.
What a great treat for me over the holidays to play on my new Mac. All my DLC works great!
@DasFolhen - just sent you some beer money via PayPal. Happy holidays!