Just happened to be riding my bike by the W this morning and saw they were trucking in some crane parts:
But this doesn't appear to be parts for the "real" cranes. This appears to be parts for the large portable crane used to assemble the tower cranes.
My guess is the smaller crane on the left, with the extending boom, is used to assemble the larger portable crane pieces. Then that crane will be used to assemble the tower cranes. And note the 3rd crane base is still there on the side, but I'm still not sure where it will go.
And overall, it looks like about 80% of the piers are done.