We started noticing delays in getting back receipt notices around the end of January. On March 3, 2023, USCIS confirmed they are experiencing delays due to filing volumes and intake delays. The delay is still ongoing as of the date of this post. Below is a sample H-1B receipt notice showing it took more than a month for USCIS to issue the notice and process the filing fee check. We are waiting...
USCIS has extended the validity of conditional green cards for 48 months for individuals with pending I-751 or I-829. See: USCIS Extends Status of Conditional Permanent Residents to 24 Months with Pending I-751 or I-829