I just purchased an MacBook Pro with the M1Max chip. I just downloaded X13 and it runs fine.
I've been using Chief for less than a year and haven't had any issues.
I am just stating to experiment with PBR. The PBR seems to work but it does not support all the features on the PC version that are shown in the Preferences for the Video Card
That's a little disappointing, although for my purposes I don't absolutely need "super realistic" renders.
I hope that CA will provide more support for bettering PBR for Mac users.