What does each delivery status mean?

Unknown – The Tracking # is not valid or does not match the provider or not supported
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Pre Transit – Carrier has received request from shipper and is about to pick up the shipment.

In Transit – Carrier has accepted or picked up shipment from shipper. The shipment is on the way.

Available for Pickup – The shipment is ready to pickup.

Out for Delivery – Carrier is about to deliver the shipment

Failed Attempt – Carrier attempted to deliver but failed, and usually leaves a notice and will try to deliver the package again.

Cancelled – the delivery has been cancelled

Error – unknown delivery error

Return To Sender – Shipment is returned to sender

Delivered – The shipment was delivered successfully