It's hard to get a good vantage point but it appeared to me they've done a lot since pouring the foundation mat on the shorter Mission St. tower:
It looked like there were a floor or several of concrete down there and I'm guessing this thing could be out of the hole by early summer.
Over on First St. the hole is just a hole as far as I know but they were pumping concrete into something down there while I was there:
Maybe it was for a base for a crane. Not enough concrete trucks on site for it to be a mat pour and I doubt they'd do that on a weekday anyway.