Yes, those 2020-21 MCIs belong to them now. Whether or not you see them a lot depends on where you are, as I've seen the bulk of them on Blvd East (165, 166, 168) or along Teaneck Road (167/177).
The garage can't hold 45' buses. But they're not using it right now since it was flooded out by Ida. They're using Garden State Plaza to stage everything, plus they're getting help from Meadowlands and Fairview IINM. However before Ida, they were making do with the space they had to squeeze what they could in that space.