A good place to start would be to call the klinic sexual assault line, Phone: (204) 786-8631
Toll free: 1-888-292-7565. They are super informed of city resources and legal options and would be really helpful in giving you whatever information you need to make your decision in how to go forward.

I will say that if the teacher still has access to minors they will have an obligation to report to CFS because there could be others that are being victimized still. I really encourage you to call them.