There is a good chance the Fifth Avenue nest has hatched. Food was visible, both hawk let the nest be exposed for long periods of time, and there were lots of flies. Plus, Octavia may or may not have done a feeding based on who you asked.
When some other hawk observers asked me what I thought, I said I'd like to wait at least one more day before calling it for certain. Things all looked right but why not wait a day to be sure.