United went to the trouble of moving its entire grounded fleet to a new storage facility, and pushed its earliest re-entry to mid-December.
American Airlines has put back reintroduction to December 3rd.
Even that seems overly optimistic. The FAA is in no rush to be seen to be pushing things quickly, as it tries to make sure its distances itself from appearing to close to Boeing.
Boeing have begun hiring temporary staff to help put the aircraft back into service, but by the time that’s done and they’re trained and fielded it’s going to be years end.
Everything else that seems to be required suggests that December for recertification might be viable, but realistically it’s going to be new year before most aircraft are back in service, and deliveries of finished aircraft can recommence.