Don’t think you can come back to Canada is as easy as providing your vaccination proof at the point of entry.
All travellers, regardless of how long they were away from Canada, continue to be required to submit their mandatory information via ArriveCAN (free mobile app or website), including proof of vaccination in English or French and a quarantine plan prior to arriving in Canada.
Bottom line, you’ll need to submit your vaccine information, within 72 hours before your arrival to Canada, in the ArriveCan App.
HERE is the link that will guide you through the process.