I'm currently testing the base model M1 Mini with Resolve 17.2b, and it performs very well for editing, and pretty darned good (for the price) in color, but upon export, it can suffer.
I put a ten-node grade (two with some blur) on a UHD ProRes HQ clip, and exported it to UHD H.264, and the Mini averaged 5.5-6 fps. In comparison, my main color machine exported the same clip with the same grade at 75-85 fps, which is right on par with cost:efficiency, considering the big unit cost about 12x more than the Mini
[Mac mini M1; 8GB vs AMD 24-core 2970WX; 48GB; dual 2080 Ti SeaHawk EK GPUs]
The Mini was perfectly usable for grading, as long as you don't mind turning on playback proxies after a considerable grade is applied. For the record, the proxies looked great, I didn't mind using them at all.
For a low-cost office solution, I can see having several Minis (or other upcoming inexpensive M1 units) for editing/post, with a render server doing the heavy lifting once production is done. Would be cool to try just for fun, may do that next week.