I wanted to say that my friend had interview and was successful.
It was DV AOS with number current in December, biometrics in February, and interview in March. He was approved at the interview. He said it was very short, mostly asking again the questions from the I-485 to verify, and the only documents examined were the letter from employer and the original birth certificate.
They did not stamp passport, said only to wait for green card in the mail, I have heard they do not stamp now? Is there any other way to verify approval meantime?
Anyways I want to say thank you to everyone on the forum, for taking the time to pool their information here for everyone's benefit. With your valuable help my friend was able to get DV GC without a lawyer. I wish all of you every success on your journey.