There are about 6B people that are old enough to be vaccinated, and 3.1B already have their 1st dose (1B still need their 2nd). Assuming 75% uptake, that means there are only about 1.4B people left to get their 1st dose and 2.4B to get their 2nd, so 3.8B doses left to do. At the current rate of administration (about 40M a day), that's about 3 months. So I don't really see world supply being a bottleneck in any kind of timeframe where Canada where be administering booster doses. The ability to administer the doses in the developing world will soon be the bottleneck (if it isn't already).
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