I don't recall receiving an email from RAM that my truck had shipped. I checked with Sandi a few days after my window sticker and was told it was on a train. In my opinion, a delivery window from RAM won't tell you much. They kept changing mine the longer my truck was in shipping.
IIRC, it took about 2 weeks for the train to take my truck from SHAP to Port Allen in Baton Rouge. From there it was about a week before a carrier took the truck to MD. While my truck was waiting at Port Allen, Sandi reminded me several times that there were a shortage of drivers and it could take another 2-4 weeks before they received my truck. Thankfully it was only a week. Perhaps MD was just managing expectations on when my truck would arrive in case it was slow. I'm not sure what an average amount of time in transit to MD would be. I believe
@triple_B has been tracking transit times for a number of dealers. He might be able to give some more insight into the min/max/avg time it takes for trucks to ship to Mark Dodge.
To contrast my experience, there was another forum member whose truck left SHAP a week before mine. MD had his truck 10 days later. Hopefully your truck will arrive quickly.