Can I upgrade to Big Sur via Remote Desktop?

The installation of Big Sur on a compatible Intel Mac will run to completion once it is given the administrator password in an intial prompt, and restart is selected. On an M1 Mac, however, the first sentence is partly true, but in the installation process, it will eventually reboot to a user login screen, where the administrator password input is required, and then installation resumes. This will ruin your day remotely.

Limited Knowledge if Remote Access.

From my experience - the initiating of the Download of Big Sur will require the User to Manually Input computer password and once is is fully downloaded and before the actually Installation process is permitted to begin , again , Manually Inputting of the computer password is required. Kind of falling in line with the same type of process for iOS updates .

FWIW, I had done updates and upgrades on my 2010 Mini when connected via Screen Sharing until it was no longer eligible for any updates or upgrades.

The only downside was that I only had the spinning wheel and "Connecting" displayed until the log in screen or any other "new OS configuration" questions appeared.

whether it still works like that I can't say.