A little update on my case:
Aug 3, 2020 - fingerprints were taken and USCIS status shows "Case was updated to show fingerprints were taken".
Today I called KCC and after the lady checked my details like DV case number, name, address, DOB, she was able to tell me about my case.
So, she said that NJ FO requested my case file on Aug 4, 2020 and they (KCC) forwarded it to them the next day, i.e. Aug 5.
Looks like smth is happening on their side. I talked to tier 1 today and he said that no news re interview. Waiting.