The Government of Canada announced that effective April 1, 2022 at 12:01 AM EDT, fully vaccinated travellers will no longer need to provide a pre-entry COVID-19 test result to enter Canada by air, land or water.
Note that fully vaccinated travellers seeking to arrive in Canada before April 1, 2022, must still have a valid pre-entry test.
For partially or unvaccinated travelers who are currently allowed to travel to Canada, pre-entry testing requirements are not changing. Unless otherwise exempt, all travellers 5 years of age or older who do not qualify as fully vaccinated must continue to provide proof of an accepted type of pre-entry COVID-19 test result
All travellers continue to be required to submit their mandatory information in ArriveCAN (free mobile app or website) before their arrival in Canada.
Link: New pre-entry test requirement for fully vaccinated travellers on April 1