There is no reason to have them on site at this time. It's way too early in the process. They are months from going vertical and they wouldn't want to tie up the space for that long. I'd almost bet that the track and supports aren't even built yet unless they are being built overseas. These jobs are planned years in advance, and they plan out the storage of the materials as part of that. We probably won't see supports until a month or two after footers start getting poured.