UPS and USPS will provide notification by e-mail indicating that a tracking number has been assigned to your order and a package label has been created by us, the shipper.
The notification email is sent once the warehouse has printed your order for fulfillment. You won't actually see any tracking updates until the package has been picked up by the delivery carrier and has been scanned into their system.
While our warehouses are technically closed on the wheekends, some of our elves have been known to work a little overtime filling your orders which explains any notifications you receive on a wheekend.
This is especially true around the holidays :)