The most developed nations will get the vaccine by March- April 2021 all things being equal whereas other developing nations might not get inoculated until 2014 after all vaccines trials there is going to be a mass production while a special designated jumbo jets will be needed to airlift it to different countries which will takes time to be accomplished globally
https://www.bbc.com/news/business-54067499 it will takes some few years before the economic growth bounce back globally, but I am quite sure we will get out of the woods within the shortest period of time.
I don't think that it will be that delayed. Donald Trump was saying that he expect the vaccine to be available in the United States from this month onward. He also said that by December, the vaccine should reach the majority of the citizens there. Various European nations were also giving similar timelines. So by mid-2021, I expect most of the world population to be vaccinated.
Still unceratin that if in the first quaret of 2021 also we may have the vaccine avaible in the world, so till then thei ris no question of anyone getting it till the time it is ocnfimred the vaccine is being approved. Also once being approved how will the distribution happen will be the key.