I have two UPS pickup locations within minutes from my home. One is a branded UPS store. The other is a drug store with a big UPS sign in the window. I actually had a pharmacist give me my stuff (the pharmacy had better hours than the UPS Store). Both were options for me to redirect my iPad several months ago.
I had some other things from Apple coming around the same time. Each and every one of them I attempted to redirect using my UPS account and all seemed to be going along just fine...except UPS changed the delivery date on all three of the orders on the day they were supposed to be delivered to my home.
In all three cases, I wasn't able to be home to sign so my hands were tied. If you are not able to be there to sign for the delivery, they return them to the depot and attempt delivery the next business day. They did not give me the option to come pick them up at the depot. Only the locations I chose to have them redirected to and in all cases, it was end of business day the next day.
Based on this, I am certain that if you redirect your delivery slated for the 25th, there is a good chance you won't actually see it at the new location until end of next business day. Also note that you can actually get it delivered to another address altogether. There is a charge for this and they warn you it will be delayed a day as well.
The program is called UPS My Choice, and it's free to sign up for. It's actually a pretty slick program, and I normally hate UPS.