I received my order number email the same day I placed the order.
Also, the order number has nothing to do with what job you are in. However, a later order could put you in a later build date. It really all depends on some magical formula of what you ordered, if your dealer has allocations...
The Long McArthur YT channel also said all trim lines for Job 2 will be increasing $100. Not sure how that effects already placed orders. I would assume you would just get the $300 hit for the pro trailer assist but not the extra MSRP increase.