Hi Shubham,

As we all know that JEE-Main April session is going to start from 5th April 2020. If it has to be postponed, the respective conducting authority which is National Testing Agency (NTA) will inform to all the candidate through an official announcement. Don't believe any rumor until any official announcement is released.

For more information about JEE-Main 2020 you can read this article .

I hope this answer helps you.

All The Best for your future!!