Current support of Radeon graphics cards on 2011 imacs

I have a 27" imac with a AMD Radeon HD 6770M 512 MB card. Running high sierra. I do not wish to change the graphics card.

I know it has been problematic to get it to work with later versions, but I see some reports of people here doing it. Im wondering if it works well, and if there are anything I need to take care of during install?

Biggest problem with the setup is that the browsers are on their way to stop working. An upgrade to Catalina or Monterey would help greatly!