Case needs to show as Sent to Department of state on USCIS site or tracker. That part is taking minimum 30days right now. 2 weeeks AFTER case shows that it has been sent to DOS, You can start to do an NVC inquiry to see if they have recieved your case and for your NVC case number. I recommend doing it once a week until you recieve it from them. Once you have case number from NVC, you can start tracking your case on their site. I have done several PI and also NVC RESEARCH with scanned copy of my NOA2 (8/8) hoping maybe it was just my status that never updated, and that my case was indeed sent. Unfortunately that is not the case(for me). Nvc has told me to wait 60days before I email them again to request my case from USCIS. And when I contacted USCIS yesterday. They told me to wait 90days for it to be sent to DOS. I have seen august 1 to august 8 approvals finally get sent to DOS last week. So at least things are moving for us august approvals.
Hopefully this info helps ya'll. I know how stressful this process is especially with the complete randomness in processing. I will reply on this thread when my status changes to "sent to department of state" ❤️❤️❤️