Our adults are still around and both late nests have now fledged, but the chicks are still at the puffed up stage and coming back inside when it rains.
Last year we still had unfledged nestlings when most adults migrated, but the parents stayed a while to get them fledged, then left and the young left about a month later, joining up with late leavers from further north.
I hope the parents of your nestlings have stuck around.