In this previous thread back in June 2020 when Apple announced the architecture transition from Intel x86 to Apple Silicon, @jody said:
I can guarantee that we will not have a version of SketchUp for Desktop that takes advantage of the new Apple chips when they’re first released. We just learned about this plan at the same time as you.
June 22, 2020 – November 12, 2020: They now had 5 months to port SketchUp with the Mac mini transition kit available to developers to do the job. Apple says that porting an existing app running on an x86 Mac to a Mac running on the M1 chip takes “a couple of days”. Maybe the official announcement is postponed to SketchUp 2021.
One thing I wonder is: will the various plugins available currently work in the SketchUp version for Apple Silicon? Or will they need new specific versions too!