Business & farm

The return has been sitting in a PO box for 3 weeks.  (II Sent Certiried return signature required)  What if they don't process by mid April.  Perhaps I should just file for an extension? According to the IRS website, Corona Virus has everyone working at home.  I had to paper file my Maryland return as well because Turbo tax did not have forms approved for Maryland yet.  I assume I need to delay filing the Maryland return as well?