Hopefully, this will help. I order new Dodge Ram HDs for a living and we ALWAYS get a 90 out projected delivery timestamp from the factory on stock orders as well as customer orders. This is the industry standard!!
Typically... we see trucks arrive at the dealership 8-10 weeks from the time the order is "accepted" for build at the factory. You do realize that the new Cummins HO 800 is here and I am placing them in the hands of my customers now! Just sent one home Saturday with some folks from Woodinville, WA. (in fact... it was a custome order)
Add this to the timeframe equation: the factory will wait to amass enough orders in a particular color and trim group before producing them - thus making the process more cost effective for them!