As tsh says, queue position is not part of the standard info they'll give you. Some people ask for it specifically, but you'll only get a rough estimate. They're not really obligated to to give out that info, and personally I discourage it as there are only two people handling all enquiries (new sales, customer support, general enquiries, the lot). Making them dig into the sales database slows things down for everyone.
Your order number is a different thing though. Once your payment goes through, you should receive a confirmation which contains your order number. If you paid via Google Checkout then that's where the email will come from. If you haven't heard anything since paying, you should get in touch with OPT on the same email address you used to organise your order.