Every medical college session starts by mid August if there is no problems in admission process. As per the official website, it has decided to start the MBBS courses as per the notification of DGMI UP or the MCI. As per the trends the regular classes will be started around mid August and might get pulled till first week of September if there is any hiccup. Yet hope for the best.
Check out the official site for a link called instructions for MBBS students 2019 for further instructions.
All the best.