Just got mine a couple of weeks ago, so this is pretty fresh in mind. Once it's shipped you should be able to go to the 'Order Status' page on the Store Website, and there'll be a 'track this shipment' button. This will bring up more details on the order, including the carrier number, and the company delivering it.
TNT were the carrier for me, and if they're yours too, then a word of caution - they suck. You can track the delivery via their website, but it usually gives you incorrect information. They'll more than likely try and arrange an evening delivery for you (between 6pm and 10pm) but they failed to turn up 3 days running for me. I kept leaving work early in order to be home from 6pm onward, and they just kept messing me about. In the end I went to the depot nearest me (Crawley) to pick it up. Just really awful. Sorry if that sounds worrying, but that was my experience of them.