Will there be a delay in graduation of 2020 and 2021 mbbs batch due to corona
Up to till there are no such official notifications available as per MCI. It is dependent on how the situation will turn into. But in general GOI is concerned with the future of the students and MCI have really good expert committee's for academics, so you can rely on them. Also if such happens then I think there will be some compensations to the students like it is happening for PhD students.
So lets hope for the best.
I hope this answer helps.