Hello student no there's no official notification from NTA about Jee main postponed. Yes application for Jee main is postponed from 06th of March 2020 to 12th of March 2020.
Application for jee main April examination starts from 07th of February and extended till 12th of March 2020.
JEE main is scheduled on 05, 07, 08, 09 and 11th of April 2020.
For more updates refer to the link mentioned below
https://engineering.careers360.com/articles/jee-main-exam-dates/amp

Feel free to comment if you have any doubt
Good luck

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