Delivery normally takes a few days. If it does not arrive, contact USCIS rather than waiting.
Official USCIS wording
On September 9, 2025, we mailed your new card for your Form I-485, Application to Register Permanent Residence or Adjust Status, Receipt Number XXXXXXXXXXXXX, to the address you gave us. The tracking number assigned is UNAVAILABLE. You can use your tracking number at www.USPS.com in the Quick Tools Tracking section. If you do not receive your card by September 24, 2025, please go to www.uscis.gov/e-request to request that we send your new card to you. If you move, go to www.uscis.gov/addresschange to give us your new mailing address.