mac OS big sur failed

Hello,

I was doing the mac Sur update on my mac. Prior to starting this update, I made sure I had enough storage in my Mac.

At first, it all went well, and the update seemed to be going at a good pace. But then, it got stuck at 10% or less. And it has been stuck like that for 2 days now.

I tried turning the computer off, and restarting it a couple times. Nothing worked. I am very concerned, as I need my computer. What would you do in my shoes?

Does anybody have any tips? Or knows any keyboard commands to “quit an update” ??