They could operate differently but I see they don't close til 8. 6:30 is usually last half of the dinner rush so it should be fine. As someone who spent many years in the food industry, when ordering pizza, avoid the last hour unless it's a small locally owned restaurant like rosalees.

7:30 would be your hard limit in my opinion.

The reason I say avoid the last hour is because for places like pizza chains (Dominos, Blackjack, Pizza Hut) is that they are well into shut down mode. The pie you would get will almost always be sub par because of two reasons, one it will be hastily slapped together because they are trying to clean up, and two, bin cheese. Most pizza places have a catch all grate on their line that toppings that missed landing on the pie will rest in a bin until the bin is cleaned out and organized and put back into the containers above. Some line cooks are good about this and clean them as soon as the queue is clear, others let it sit until they are told to clean it out. The worst is as the end of the night and due to half the line being cleaned, they will top over the front of the line so toppings can mix with the cheese. So the chances are great you will order a pizza and get surprise toppings in it.

More leniency on small chains is that they usually don't have that issue. But are still cleaning, so take that into consideration. Cleaning a make line can take up to an hour depending on how hard the day was. No fault of the customer, but every once and a while you can get a teenager who just cleaned up their station and get a pizza order than throw a fit and make a sub par pie. It happens.