A bit late; these companies already have vast stocks of the vaccine ready to be deployed once they get greenlit. They will be getting - and have already received - orders and reservations for tens, hundreds of millions of units of a potential vaccine, awaiting testing and approval; see https://www.dailymail.co.uk/news/article-8852159/The-video-w..., citing they're aiming to produce 1.3 billion doses next year.