Typical approval is 9 months of announcing Final acceptance of letter - so it will be Apr 2021
If they accept priority review - it will 6 months and reach Jan 2021
Unless you are a BP - it takes 1 to 2 months to fill inventory (fully labeled and packaged) and then you have to get the sales force to start convincing the Doctors while company has to get insurance payouts to agree for payments. Till all this is completed you do not see first sale and any revenue.
Check history of approval and product launches by young biotech - specially the 1st product launch and you will see the timeline