The determination on your eligibility for a visa can only be made by a consular officer on the day of the interview and only after all of your documents have been furnished and the results of the medical examination received.
You should not resign from employment, sell property, or make final travel plans until your visa has been issued and you have the passport and immigrant visa package in hand.
If you are found eligible to receive a visa on the day of the interview you should allow approximately 10-15 working days for your application to be processed.
Once issued, the passport containing the visa and the immigrant visa packet containing your documents will be handed to the courier company for delivery. On receipt of your documents, the courier company will send you a message by text/email containing a tracking number. This number may be used to track the delivery online at https://ais.usvisa-info.com/en-gb/iv
Your documents will be returned to you in a large envelope. DO NOT OPEN THE ENVELOPE, if you do so, you will invalidate the visa. It should only be opened by a U.S. Immigration or Public Health Service officer.