Once you get the genetic sequence sequence you want, you can "print" out the vaccine. After BioNTech received the genetic sequence of SARS-CoV-2 in email, they

Once you get the genetic sequence sequence you want, you can "print" out the vaccine. After BioNTech received the genetic sequence of SARS-CoV-2 in email, they had small batch vaccine candidates out ready for animal testing within days. There are still other steps that take time. You need to figure out what is the mRNA you want, then you need to test a new vaccine candidates for adverse effects.