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The USCIS publishes this advice regarding the extension of a US visa:
Generally, nonimmigrants must depart the United States before their authorized period of admission expires. However, we recognize that nonimmigrants may unexpectedly remain in the United States beyond their authorized period of stay should apply for an extension or change of status in advance. Should this occur, the following options are available to nonimmigrants:
Apply for an Extension. Most nonimmigrants can mitigate the immigration consequences of COVID-19 by timely filing an application for extension of stay (EOS) or change in status (COS). U.S. Citizenship and Immigration Services continues to accept and process applications and petitions, and many of our forms are available for online filing.
No biometrics need to be paid for since offices are closed.