Hello,
CCMT 2020 first round has already started and the filling, locking of choices and fee payment was extended up to July 15, 2020 till 11:59pm. Round 1 seat allotment was supposed to be out by June 17 due to work restrictions it is getting delayed by a bit. So you need to wait until then. You can check the updates and other information here https://ccmt.nic.in/WebInfo/Page/Page?PageId=1&LangId=P