Hey Vantika! It would have been better if you had mentioned which document verification are you asking for. If you are wondering about the NEET 2020 document verification, then the dates haven't been confirmed yet. Due to the postponement of the release of NEET 2020 results to October 16, 2020, the counselling seems to take a while. As soon as the results are out, NTA will announce the counselling dates too. Stay tuned to the official website of NTA NEET for the details:

https://ntaneet.nic.in/ntaneet/welcome.aspx

https://www.nta.ac.in/

Hope this helps!