The syllabus will be released before 5 or 6 months of exam and you know the situation now for covid, it may change or may not change. I think every year topics may change for jee main examination. so if u want to score the best rank, you have to check this year topics and start reading and keep going on

ALL THE BEST

Dear Aspirant,

I am providing you a link which you should check out to get an overview of the syllabus. I highly recommend you to start studying and don't wait for syllabus to get released as it will be a wastage of time. For a JEE aspirant time is the most valuable asset. According to me syllabus doesn't change much with respect to the previous year. So just get started!

Link: https://engineering.careers360.com/articles/jee-main-syllabus

Hope this Helps!
Good Luck