I called my dealership today to inquire about this; specifically that fleet buyers will get trucks first, then the few six-figure buyers, then the rest of us who are waiting on WTs maybe in a few years. They said GM hasn't told them any specifics, but they expect more specifics in July or August. They also said they really doubt that normal sold orders will be put on the back burner to fleet customers, because GM (and the dealers) make more profit per sale on normal sold orders. Therefore it's assumed that GM will actually want to push out orders to normal customers at the same time.
I noticed that Ford officially stated that shipment does not coincide directly with time and date of reservation/order, but rather it will have to do with trim and specific options selected. Basically, the easier the truck is to build, the faster the buyer will see it. This has also been my direct experience with Jeep/Ram pickups.
So, I'm going to continue to hold out hope that a guy like me wanting a lightly optioned WT trim will be able to snag one at some point in 2023 until I get concrete word from GM stating otherwise.