https://news.ontario.ca/en/backgrounder/1000806/using-your-vaccination-receipt-frequently-asked-questions
Who is considered fully vaccinated?
An individual is considered fully vaccinated if they have received:
The full series of a COVID-19 vaccine authorized by Health Canada, or any combination of such vaccines
One or two doses of a COVID-19 vaccine not authorized by Health Canada, followed by one dose of a COVID-19 mRNA vaccine authorized by Health Canada
Three doses of a COVID-19 vaccine not authorized by Health Canada
They received their final dose of the COVID-19 vaccine at least 14 days before providing the proof of being fully vaccinated.