Extension of USA visa 2nd time

  1. I am in the USA on a B2 tourism visa. I applied and paid for an extension which is still pending, though I got this note from USCIS: On January 8, 2021, we scheduled you for a biometrics appointment and sent you an appointment notice for Receipt Number —–. Please follow the instructions in the notice. If you do not receive your appointment notice by February 7, 2021, please go to www.uscis.gov/e-request to request a copy of the notice.

  2. do I need to file for a second extension or not?

  3. How would I file for a second B2 visa extension? Can it be post-dated? How long for are the extensions granted? Thank you, community!