Filling of returns...

sagar tatti (75 Points)

11 October 2020  
I am sole proprietor of cartridge ink filling..
due to pandemic I closed my business on 21st - SEPTEMBER- 2020. so i filled up to date every return GSTR1, GSTR3B.. and I applied for CANCELATION application on 6/10/2020.
MY DOUBT IS WHETHER I NEED TO FILE SEPTEMBER MONTHS GSTR1, GSTR3B.? AND HOW MANY DAYS IT TAKES FOR CANCELATION?