The Meaning of Order Status
Pending: Order's placed, but need further review before processing. Often it's because your payment used a different currency than USD and needs to be reviewed by paypal; or your ordered item needs to confirm some details before processing.
Processing/Completed: Your order's being processed - mostly being tailored.
Shipped: Your order's being shipped, there's often a track info updated at the order details, and also sent to you by email.