what does pre shipment on usps mean

what does pre shipment on usps mean refers to the status of a package that has been scheduled for shipment, but has not yet been picked up or processed by USPS. Pre-shipment means that the shipping label has been created and the package is ready to be shipped, but it has not yet entered the USPS system. This status may remain for a while until the package is scanned at a USPS facility or during pickup. Once the package is in transit, the tracking status will be updated to reflect its movement through the USPS network.