It can take up to 48 hours for tracking info to show up in your carrier’s system. So, to minimize confusion, you should let your customers know this beforehand in your order confirmation email.
Note that for international shipments, tracking info might appear even later. It’s also the case for shipments coming from our Tijuana facility, as we first ship items to the US and sort them at our San Diego facility. So don’t worry, your shipment is still on track for its destination.