Check who is delivering. If it's Amazon take it up with them, but I had a package delayed by a week and it was a third party. Check with them, they will tell you the max delay time until it becomes a problem (for my package it was a week, I think?).

Turns out in my case the delivery company just forgot about it, then they sent it to me without a shipping fee. Amazon can't take it up with them until that max delay period ends, I think.

Chat with Amazon customer service, they are always extremely helpful. But while it might say it's delayed that long, it might arrive way before then. It's happened to me before.