Based on what happened here in SA, stuff was basically put out as it was unloaded off the truck. Deliveries arrive to stores at different times and days, even within the same big box stores.
For example, one TW store here had all of the big allocated bottles ready for 10am opening because the truck had arrived early and they unloaded and stocked everything prior to opening. I got there within 30 minutes of opening and they were already cleaned out of the “prime” allocated stuff (WFP, W12, OWA, ETL). The guy at the store said there were 50 people in line prior to opening.
Another location in town had their delivery truck arrive just before opening, so it took them until about noon to get that stuff out. I got lucky and snagged an OWA, but there were still at least 30 people ahead of me in the store.
The flippers have contacts in stores that tip them off when the big stuff is coming, so they’ll always be at the front of the line. The only real way to get ahead of them is to keep an eye out for local bourbon Facebook groups in the big Texas cities to see what may be hitting, and then be willing to line up at 8am. Otherwise you’ll be paying secondary.