When did you order? Google is sending the codes in order of the date of the Stadia-order.
Read in another thread that users who ordered at 7th June have received their code, while I for example haven't got it yet (ordered at 17th June), so depending on that it might still take a bit.
Stadia or Hardware support are recommending though to check back with them when you haven't received one by Sunday.
Hope the best for you! At least it's nice to see that you received the package! ![]()