OK, here's some info that a lot of people are missing*
If you've ordered from Apple:
Apple statuses tend not to get updated realtime. I've had stuff delivered to me from Apple while it's still showing as 'Prepared for Shipment'. Just because your order still says one thing (e.g. processing), it doesn't necessarily mean it hasn't moved on to the next stage for anything up to 24hrs.
I'd expect status to keep changing to shipping throughout today. Lots of people's won't change till tonight and they won't get their despatch emails until around midnight or the early hours of the morning, but they'll still get delivery tomorrow.
Even though Synchreon (or whatever they're called) are showing as the courier on orders so far, the actual deliveries will probably be split between the big couriers to ease the load (don't know if this is just the main courier sub-contracting). I have had stuff showing as Synchreon before which has been delivered by DHL/UPS etc
Apple tend to be reliable, if their pre-orders are going to be delivered tomorrow (and it looks like they are), then unless they've told you of any delay, yours should be on the van. But then it comes down to the courier, sometimes on busy days they just run out of time. Sometimes they'll carry on delivering into the night, but in many cases this depends on the individual driver - some will just reach the end of their shift and go back to the depot never mind how many deliveries they've got left. However, even on a normal day most couriers deliver up till 6 or 7pm. Remember though that if you don't get a Friday delivery, don't expect it till Monday at the earliest!
Tomorrow will be even more frustrating than today - all morning this thread will be full of "Woooo! Mine just arrived" with no mention about whether it was an order from Apple, CPW, Orange etc or what colour/size and whether they ordered anything else. And it's no good asking because they'll have gone off to play with their new toy!
I don't know any of the above for a fact, just basing it on all my (and other's) previous Apple pre-order adventures.
*Sorry, it's sometimes a bit rude to go big and bold, but I didn't want to get lost in all the "mine's still processing" posts.
I'm just going to go ahead and ignore all the good sense in this and say "DAMN YOU, APPLE?! GET TO SHIPPING MY PHONE!"