I couldn't last year, though I may try again. I too would like it delivered to work, but we'll see. My office works half day Fridays, so I'm not too concerned about it. My UPS guy usually shows up around 5:30PM, and last year with the 4S didn't get there until nearly 7PM, so I should be good (unless it's shipped FedEx this year, in which case if I miss it, I guess I'll go pick it up Saturday or Monday).
I would call Apple sometime later today and ask a rep. You definitely don't want to run the risk of having your order canceled after all the phones in the first batch are pre-ordered. I think they had some of these problems last year.