This is a user to user help forum. Contact Dell directly for help with orders. However-- it is not unusual it is taking this long as you already got acknowledgement that the order was received. 
I ordered a Dell Inspiron 16-inch laptop from dell.com and I received the acknowledgement email within minutes but I haven't received the order conformation email yet. Ordered on : 21-Oct-2022 48 hours have passed but no confirmation email yet.
Order confirmation email not received even after 48hours of purchase