The Post Office delivered your card to the address USCIS had on file. This is the last step: your case is complete and the physical document is in your hands.
What happens next
Nothing further is needed. If the card never arrived, contact USCIS -- delivery was recorded, so it may have gone to an old address.
Official USCIS wording
On September 9, 2024, the Post Office delivered your new card for Receipt Number XXXXXXXXXXXXX, to the address that you gave us. The tracking number assigned is XXXXXXXXXX. You can use your tracking number at www.USPS.com in the Quick Tools Tracking section. If you move, go to www.uscis.gov/addresschange to give us your new mailing address.