Several airlines have started to use (or have plans to introduce) digital health passports / IATA Pass. Haven't seen any announcements from AC.
Digital Health Passports, airlines leading the way - British Airways, Virgin Atlantic, Iberia, Alaska Airlines, United, Cathay Pacific, American Airlines, Qatar Airways, Swiss, Singapore Airlines, Lufthansa
VeriFLY App - American Airlines, British Airways. Other airlines including Alaska rolling out imminently.
IATA Travel Pass - Emirates, Eithad & Qatar to trial (expected to adopt by end of first quarter). COPA to start trials by March.
Which Airlines Are Already Using Health Passports? - Simple Flying
Does Air Canada have plans to test or launch anytime soon?