At the moment they're testing their wings and getting used to the sudden space. I expect them to turn up tonight and start making "feed me" noises at me.
The three youngsters (plus one) aren't Made Birds yet. I fully expect the local mafia to start hunting them off soon. I'll provide protection if I can but that will only last for as long as they hang around the back door. After that, they're on their own.
So. Hooray!