Do you have confirmation on the 500 count? When I visited on Saturday, and when TrevP of M3OC visited on Monday, it looked to be about 300 cars on site give or take. There are a total of around 700 more cars in the GTA in different lots if you know where to look.
I've been hearing 7 deliveries per time slot, 15 minute time slots, 9 hour days, which is right around 250 cars/day delivery pace. I've heard rumored rates from various sources ranging from 150 cars/day to 300 cars/day. My understanding is that like December 2017, they've rented the International Center for the entire month.
This pace is considerably faster than 2000 cars in June. Should be more apparent when deliveries start happening later this week. I've not seen anyone with delivery appointments later than June 8 yet, so I'm not sure what to make of that.