CBC didn't say anything about possible sentences, but I found a city news piece from 2022 that talks about mischief. It isn't very useful though:
Kicking a wall could result in a fine, while mischief to a war memorial or blocking significant portions of downtown could see up to 10 years of jail time, Toronto criminal lawyer Karen McArthur said.
In the most severe cases the maximum sentence is life imprisonment, Peters said.
So, they could be looking at anything from a fine to lifetime imprisonment?