You are correct. I used to manage a shipping station in a plant. When the label is printed the package has "manifested". The website for UPS or FedEx tracking will usually say no information at this time. We never did it but: if one knows the weight and size of the package they can print the shipping labels before the component has been picked from the warehouse.When the label is printed the email is triggered. You won’t see any tracking information until the package is scanned at the actual shipping facility
Same thing happens with Amazon occasionally