When the vaccine will be available?

When proven useful: A vaccine first must show good results in testing on large numbers of people, meaning the vaccine is effective and is safe to use. It then gets approved by the governmental agency (FDA in the US). Finally, the vaccine gets mass-produced, packaged, shipped to clinics, and becomes available to the public. Many vaccines are available for a variety of diseases at this time.

COVID 19 vaccine: Clearly you wrote in a while back, so here is an update. Pfizer and Moderna have both rolled out in this country with emergency use authorization (EUA). Per Dr. Fauci, Johnson & Johnson 1 dose vaccine might be approved in as little as a couple of weeks. Novavax also has a vaccine in trials.