I placed my order around 6:40PM EST and I received my shipping confirmation at 10:25PM EST to give you an idea. I'm pretty sure that Amazon will do next-day delivery as long as you get your order in before 4PM PST (7PM EST), although I've seen some different times, which might rely entirely on which warehouse they're shipping from.
That's one reason why I like Amazon more than Newegg... they usually tell you how long you have to order until you have to wait until the next day for the item to ship. Newegg, it's usually just a gamble (or just pay the rush processing fee) if you order after 12PM EST.