Have you checked that your USCIS status has changed from “Approved” to “Sent to Department of State (DOS)”? That’ll tell you whether USCIS has sent your application to NVC (DOS) yet. The average wait right now is over two months between NOA2 and Sent, so you’re probably less than a month away from receiving that change in status. Might not even need to contact NVC yet if your application is still with USCIS.