The garage tends to fill up between 7:00am and 7:15am. It tends to fluctuate a little bit because they are doing matinence work on the garage and varying amounts of parking stalls are blocked off as a result. But it is almost always full by 7:15am.
By 7 am it is almost full, specially with the ongoing maintenance works.
The structure will be full by 7:30 on most days. You might find a spot on 5th level after then but, from my knowledge, 6:45 a.m. is the latest you'd want to arrive.
The garage is normally full by 7-7:30am weekdays.
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