I bought an M1 MacBook Pro and still cannot get used to working with it without TotalSpaces. According to Binary Age, the developers, "The support in Big Sur is imperfect, and we are not able to support Apple Silicon macs at all.
"So we have to admit that it’s the end of the road for TotalFinder and TotalSpaces2. We will not work on making TotalFinder or TotalSpaces2 work with the next version of macOS, and they will not be ported to Apple Silicon macs."
That's the bad news. The good news is, "For a while now we have been working on a new version of TotalSpaces, TotalSpaces3. This version will work without modifying the system, and works with SIP enabled. It is a significant challenge to achieve an equivalent experience without the level of access that code injection provided us, but we believe it will be more than usable.
"It is intended for Apple Silicon macs only (at this time), and is currently in private alpha testing."