Looks like Proton is still progressing at a steady pace forwards. I was surprised to see about a month back it played the new Assetto Corsa Evo fine on my Linux desktop. It did not play the first week or two after I bought the game (without even thinking of checking if the compatibility was ready yet).
Ironically enough the DiRT Rally 2.0 mentioned now for compatibility, I think has a native Linux install of that game as I’ve been playing that a long time already on Linux.