Sounds reasonable. Residential towers are typically near ready for occupancy 6 months after full top-out from what I've seen around Metro-Van on average. So if this tower official tops out in the Spring, Fall/Winter is reasonable for the entire building and I'd imagine for the lobby + hotel, it would definitely be that timeframe given it is already topped and has been for a while.
I have a feeling they'd want major construction complete before opening the hotel portion just for the appearance aspect of things. Nothing worse than staying at a hotel with major construction on opening day.
So say May top out, + 6 months is Oct/Nov which is still fall.. well technically up to December 20th..