I would NOT put it that way. I have added an update after calling sales to get more data. What is frustrating for the buyer is if the DS sees the same range of dates as sales, but is most likely waiting for positive verification of the shipping arrival date before setting any possible delivery date.
Another delay could be Christmas Day. My range of dates includes this weekend, so if the driver took a vacation day, that could delay the process. Too bad UPS or FedEx doesn't track the shipping of cars.