Hyacinth: Will It, Won't It?

A full month after our paperwhite bulbs bloomed, the hyacinth bulb we have been "forcing" finally looks like it might be ready to flower:

What's taken it so long? Hyancinths are notoriously slow, needing a long time in the cold before warming up to the possibility of blooming. But even so, two and a half months seems like a very loooooong time. Not that we mind. We're ready for a little spring here in Brooklyn!