As noted, the vaccines will have different efficacy and population targeting. The National Advisory Committee on Immunization will provide advice. The assessment on having an ability to provide vaccinations to all Canadians who want them by the end of September was in recognition of approved vaccines and recognizing other ones in the pipeline. I'm not going to speculate on the specific timeline. The intent with approved vaccines and deliveries is to immunize Canadians as quickly as possible.
On February 2nd, 2021. See this statement in context.