@eamo The delivery of codes is tied to the shipping of the hardware, not the receipt of it. So no, the Google Store not reflecting a "delivered" status is not the cause for any delay in getting your code.
When did you preorder? My understanding is that everyone who ordered in June should have received their codes by last night, and that they're now pushing out codes for orders from July in the order in which they were placed.
My code just arrived! Hopefully they are through the backlog now and folks can start getting in and playing and putting this nonsense behind us!?!?