I would assume the information isnt readily available beause the stock numbers are constantly changing, so instead of giving specific numbers on a constant basis, they simply update with telling them "IN STOCK" or "OUT OF STOCK". and you cant call the ware house because, well could you imagine how much longer it would take if the warehouse needed to be answering phone calls from customers asking where their phone is?
If the phone was in stock when you ordered it over the phone, You should have the device within 7 Business days.
FYI, I was 22 on the Business Reservation List for a black S4, and my device just shipped. Scheduled for delivery by end of day tomorrow. So anyone else on business list you should be seeing your devices soon.