I've tried this three or four times, now, including for the package I got 5 minutes ago.
For whatever reason, USPS (United States Postal Services) is unnaturally slow to get packages to me. However, as soon as I sign up to get text messages on where the package is, I get it one or two days later. Minus Sundays and holidays, of course.
I'm also signing up for the USPS Informed Delivery thing to, "...[D]igitally preview [my] mail and manage [my] packages." The only drawback is that they do confirmations through regular mail.