There is no explicit announcement from USCIS with respect to visa extensions due to Coronavirus at this time. But, going by the list of previous natural calamities and USCIS announcement of keeping Coronavirus medical treatment out of public charge rule, COVID-19 spread should make it to the list in good faith. USCIS has allowed Hurricanes and California Wildfires among others as special situations. Coronavirus has already been declared a national emergency by President Trump.