It works great. It's usually not proton that's the issue. Iirc the drivers tend to lag behind a little bit and it really depends on your distribution's maintainers for how quickly and seamlessly the newest drivers are made available. PopOS is one of the best(imo the best) for Nvidia support.

I had a 3070ti (that I sort of regret swapping for a 6700xt) that worked really well. I swapped because I bought into the myth that "Nvidia sucks on Linux" and I figured if my 3070ti was this good, then a Radeon card would be even better. I just traded small nvidia issues for more annoying Radeon issues and, for me, I got the bad end of the deal. I miss CUDA and the nvenc encoder. Radeons equivalents are 5 years behind it feels like and/or the open source driver that people rave about doesn't support them, so you have to use the proprietary driver which isn't as good for gaming.

All that to say, don't let having an Nvidia card hold you back.