Check back later was the correct response here. As of today, 01-10, the "E-file Forms" button is no longer grayed out. Our W2s now show "E-FILE PROCESSING" after submission. I refreshed a few times but it's pretty clear that they DID process since Intuit soon after sent confirmation emails for each submitted W2 saying, they "... were electronically submitted ..." and also " Please Note: It may take several days to process and return an acceptance." so bottom line ... they're submitted, so we (you) can move on even though it says "E-FILE PROCESSING".
