Here is a video the shows how they are packaged:
http://youtu.be/aZgvFfbGubI
Pretty much once they are put in the box the shipper will have FedEx pick up the box in the late afternoon.
FedEx will then overnight the package to you. It should be on your door by noon.
Most shippers do not require a signature so in the case that you do not answer the door they will leave the box there and not take it back with them and try the next day as this would result in a dead snake.