Back orders iPad mini and apple pencil2

So i was led to believe That I was going to receive my merchandise within two days. I got an email saying thank you for your order and I click the order number or track your package and it still says processing. It would really help To set realistic expectations For customers and expect a shipment or some sort of notification that we are aware that your order is back ordered I had to call and wait on hold for three hours not fun not happy thinking of switching