(v2020.11.09VR)
As the title says this is not full VR support yet, you can look around, but you still have to play with keyboard and mouse.
Or with a wheel:
So hand tracking is not working yet, and to navigate in the menus you have to remove the hmd.
You can recenter the view anytime by pressing G.
And this is not exclusive to VR but you can hide the UI or HUD with backspace if you want.
If you have some rendering problems or discomfort, disabling depth of field, post processing, antialiasing or heathaze may help, but there could be (and seem to be) other problems which these won't solve.
Also disabling head bobbing is advised, though maybe it doesn't do anything in VR anyway.
So far we have tested it with Oculus Rift CV1 and Valve Index, but I think it should work with anything that is supported by SteamVR.
You can access it through the betas.
(By right clicking the game in your steam library, selecting properties, betas tab, and from the drop down menu select "vrtest - VR test")