The eyasses are starting to do some basic wing flaps. Soon this will turn into full scale flight training.
Red-tailed Hawks usually leave the nest after about 6 to 7 weeks. If our estimates of the hawks ages are correct at somewhere between 3-4 weeks, they should fledge (leave the nest) in mid-June. They'll then, most likely, spend a few days around the Cathedral before moving into Morningside Park.
During the first few weeks in the park, the parents will feed the fledglings. But soon the parents will be teaching the young to hunt on their own. In late summer, the fledglings will be able to take care of themselves and will at some point wander off in the fall or winter.