See until and unless the government gives a clear notification, its uncertain. Now the news you have been addressing is not know to me but if you are asking this on the basis of the increase in the COVID cases then there can be probability if it gets worse. Nothing is predictable. So you shouldn't focus on the cancellation until and unless there is some info's available from the government.

You can visit the link below to check the HSC 2021 time table:

https://school.careers360.com/articles/maharashtra-hsc-time-table

I hope my answer helps. All the very best for your future endeavors!