Copied from USCIS:
U.S. Citizenship and Immigration Services is temporarily waiving the requirement that the civil surgeon sign Form I-693, Report of Medical Examination and Vaccination Record, no more than 60 days before an applicant files an application for the underlying immigration benefit (including Form I-485, Application to Register Permanent Residence or Adjust Status), until Sept. 30, 2022.
This temporary waiver will help applicants who have been affected by the COVID-19 pandemic and related processing delays, which have sometimes caused delays in completing the immigration medical examination. Temporarily allowing applicants to submit their underlying application for an immigration benefit with a completed Form I-693, even if the civil surgeon signed more than 60 days prior, will allow individuals to complete the application process without the need to undergo another immigration medical examination if Form I-693 is otherwise valid.
The temporary waiver will benefit many applicants, including Afghan nationals evacuated under Operation Allies Welcome who have completed immigration medical examinations at government-run facilities but were not able to apply for adjustment of status within 60 days of the completed examination.