The FAA issued an SFAR that, among other things, deals with the issue...
The FAA finds, under the extraordinary circumstances of the COVID-19 outbreak, that extending the 24 calendar month requirement of §61.56(c) by up to three calendar months will not adversely affect safety, provided the extension applies to active pilots and certain risk mitigations are met. The three calendar month extension applies to pilots who were current to act as PIC of an aircraft in March 2020 and whose flight review was due in March 2020 through June 2020. To mitigate any safety risk, the pilot must have logged at least 10 hours of PIC time within the twelve calendar months preceding the month the flight review was due. This flight time must be obtained in an aircraft for which that pilot is rated.31 In addition, eligible pilots will need to complete FAA Safety Team online courses totaling at least three WINGS credits.32 The courses must have been completed in January 2020 or later to meet this requirement.Completion of the safety courses demonstrates continued learning and pilot professional development.