9/6 is the PS5 date. Still no word from Larian on the Mac date - the last I heard was when they originally announced it would be delayed, and that they didn’t want to give a date and not meet it. What worries me is that they are willing to give these other dates - PS5 & Xbox - but not even a window for Mac.
They were touted as having their engine running on Metal, and it was one of the first major apps to port to Apple Silicon. The early access worked fine. Unless there was something in the later acts that really broke performance, I can’t see why they didn’t go ahead and release with the engine they had.