For me it is supported better on Linux than on Windows because my GPU (RX 5700 XT) does not actually have HW raytracing but Mesa has a software fallback for it :-P. If nothing else i was able to see what the fuss was all about[0][1][2].
Though, well, performance was a tiny bit lacking as you can see (i actually had to modify the Quake RTX code to let me use lower resolution scale than the official binary allowed :-P).
Varies from game to game. I know it works in Cyberpunk 2077 but you need to include some special launch parameters. Portal RTX just worked. RTX in Control doesn't work even with config changes.
Though, well, performance was a tiny bit lacking as you can see (i actually had to modify the Quake RTX code to let me use lower resolution scale than the official binary allowed :-P).
[0] https://i.imgur.com/3XNakAs.png
[1] https://i.imgur.com/AKJInNg.png
[2] https://i.imgur.com/faagg2Q.png