Anil, JEE Mains is usually scheduled twice a year. Once in January and once in April. January session of JEE Mains was conducted as per schedule but to due to Corona pandemic, April session was postponed and according to the new schedule, it is scheduled from July 18th to 23rd. It will happen on July 18th, 19th, 20th, 21st and 23rd. This is the latest information as of now. If your question is whether this exam has been postponed again, then no. The current schedule remains unchanged atleast for now.

Hello Aspirant,

JEE Main 2020 April session is postponed. It will now be conducted in the month of July. JEE Main 2020 July session will now be held on 18th - 23rd July, 2020.

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-important-dates/amp