We're developers from the Half-Life: Alyx team. Ask us anything! : HalfLife
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With the exception of some tweaks to the absolute final scene, the game is done. Lots of us at Valve, as well as playtesters, have played through the entire game multiple times.
Right now we're primarily polishing and fixing bugs, which is where we'd hope to be at this point in the development cycle. We're confident we'll hit our intended release. (We let the Valve Time happen before we announced the game.)
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Right now it's around 80 people, which puts it as the largest single team we've ever had at Valve.
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Our locomotion and comfort features are all done, including things like Seated, Left-Handed mode, etc. We have almost all our accessibility work done as well, but there's a little bit more we'd like to do there (support for one armed play, for instance).