is there any port option being added to the truck? If so that will add time to your delivery date, but if they gave you a guesstimate time of delivery, it should be about right.
I think it can take 2 to 3 week or more after the build date to get the truck delivered.
My truck was built in Texas on the 5th and on the 12th it was put on a train. I am having port options added to the truck, so that will take extra time. I think it will be a week or two until I receive the truck.