Unlike Windows 11, there's no confusion over which Mac will or won't run the next-generation MacOS. There's no clumsy compatibility tool to run, and there's no doubt.
There's a clear list. And here it is.
That's it. Some features of the new release won't be available to Intel-based Macs, but the list of features is small and hardly going to get many Mac users clutching at their pearls.
This does mean that it's the end of the line for some Macs running MacOS Big Sur. If you're running one of these Macs, the end of the road is nigh.