Hello Aspirant,

CSAB counseling round usually starts after JoSAA councelling but due to the ongoing pandemic the government hasn't released any official date for the conduct. So it's important for you to keep visiting the official website and wait for any further updates or release from the officials

Also to know for information about CSAB 2020, Check out the link below

http://engineering.careers360.com/articles/csab

Hope this helps

Good Luck