You can see the updates here: https://www.protondb.com/app/1086940, looks like some people are able to play and others aren't.

There's also Gaming on Linux, which, as the name suggests, focuses on Linux gaming; anyway, this is the latest news: https://www.gamingonlinux.com/2023/08/baldurs-gate-3-steam-d...

It’ll be on geforcenow soon if it’s not there yet and it seems to run fine on steam os with proton experimental

SteamDeck proton experimental has worked flawlessly so far.

It says it's playable on Steamdeck, so it works at least on that one Linux device.

Im playing it on Linux (Tumbleweed) right now. Works fine.