I use a quest 1 on Linux.(According to the alvr the quest 3 is also fully supported) Played about the last half of half life on Linux.
However some VR games just don't run well under proton I still have windows installed for that. Even if i didn't boot into windows for a half year now.
Also first recommend installing Linux in dual boot with windows if you don't know if al your programs/games work. Nowadays most stuff works but you can always keep windows for just in case.
Yeah I saw that documentary already