UPSC has just released that it is deferring the interview program from 23rd March to 3rd April.
The notice says the below
Due to the prevailing conditions caused by the Novel Corona Virus (COVID-19), as a precautionary measure, the Personality Tests (Interviews) of the candidates of the Civil Services (Main) Examination, 2019 scheduled from 23rd March, 2020 to 3rd April, 2020 are deferred till further orders. New dates for the Personality Tests (Interviews) will be informed to the candidates in due course of time.
The notice, though not signed by any authority of UPSC is uploaded on the UPSC website ( upsc.gov.in )
You can view the notice here