With Oculus you will have to use ALVR. It is a two-part software with a client running on the headset and a server running as a SteamVR plugin on your PC. Setup used to be a pain in the arse but it’s gotten better. But it’s still Alpha software so things might break down the line.

Don’t expect every game to work. I tried both Batman VR (older one) and 7th Guest and they didn’t work. But most of the other games do work.

The good thing about the Meta Quest headsets is that they also work without a PC. The bad thing is that you’re at the mercy of Meta. My Quest 1 is still working quite well but no longer gets any OS updates. Normal Android stuff. Maybe the Pico 4 (or whatever their current one is) is better with that. No idea.

That said, I love the standalone headsets because you don’t have to fight with a cable with them. It’s great, especially if you have the space for room scale VR.

In terms of VR modded games they might not work on Linux. I don’t know about those Unreal games but at least Alien Isolation’s VR mod cannot work on Linux unfortunately.

Don’t expect to get any official support.