On March 18, 2020, USCIS announced offices temporarily closed to the public.

Visit https://www.uscis.gov/about-us/uscis-office-closings to check the latest status of USCIS Office near you. You can also share your experience with USCIS offices in the Comments below.
Thanks for the info. My appointment is March 19th. Do I need to reschedule?
Hi Li, thanks for your question. Your appointment should be rescheduled by USCIS. You shall expect a notice from USCIS after the office is reopened to the public.
Please let us know if you have any other questions.