I’d say there’s a 99.99% chance singleplayer works on Linux. Everything does now, unless they choose to not support it. The big question is if online does. It looks like maybe GTA5 Online works, but may require some work. Some things say it has kernel level AC, but some things say they’ve gotten it working. I’d say there’s probably a 70% chance online works.

I’m not purchasing it regardless though.