Sketchy

I'm looking for a little help here. Approximately 3 weeks ago I placed an order with my dealer for a '19 1500 AT4 Dbl cab. I know it's late in the model year for orders, but I wanted the 6.2 with the performance off road pkg, as well as, I wanted it in black. The combination has been impossible to find off the lot anywhere near me. Anyways what I was wondering is if any of you guys could tell me what your experience was for the time line when ordering and what to expect. Like I said it's been 3 weeks, according to my salesman the order hasn't been "picked up" by GM yet. So what I assume that to mean is it hasn't been given a build date yet. Just wondering about how long it takes to get a build date ect. The sales guy told me it can take 4-6 weeks but he also kinda said they my never build it due to constraints and what not, maybe that was a ploy to make sure I would do a "sold order" deal with them (which I had no problem doing) but idk. He implied it would be more likely to be picked up if it was a sold order. Any info you guys can provide would be awesome. Im kinda outa my league on this one, never ordered a vehicle before, but I figured if I'm spending 70k just as well get exactly what I want.