I would share the state in question, as they don't all do it the same.
If your state doesn't charge it upfront I would make sure Apple knows and then I'd expect them to only charge any amount above the limit. I don't think your shipping time should be an issue, as even though your credit card (assuming that's how you're paying) won't be charged until it is shipped, if you look at your receipt the purchase date will be the day it was ordered.
If your state rebates it back to you, then you just need to make sure of the aforementioned dating of the receipt.
Happy purchasing!