>>308560309
I can't find any official numbers, but looking around, it seems like 40-50ms for the OG Quest, and I can't imagine you can really get that much lower on a Quest 2. Most people who use it claim it's not usually noticeable though.
I'd wait for final Quest 2 reviews either way since none of the hands on stuff has been with final software, picture quality over Link should be a lot better, but Link hadn't been optimized during early hands on tests.
Reverb G2 is worth keeping an eye on too depending on your budget.