Sorry, I was a bit direct. There may be a way to test, how "normal 2D" games render on Quest? Does it show something or is it only for 3D games with the Quest logo on it?
2d games appear as a floating window.
If it works on GearVR as 3d, it probably works in 3d on Quest, then the next biggest question is does it work with the controllers... That's often an issue.
There are lots of Quest owners on itch.io looking for games now (Sidequest is gaining popularity, but some of the listings on it require visiting itch to purchase the game).