Hi,
I wanted to create this post for individuals who were recently (2019) approved and waiting for their case to be submitted to the National Visa Center (NVC). I was not sure if anyone is aware of this helpful link below. It provides you with the steps of for NVC and their processing time. Hopes this helps and I hope others will share their experience and helpful information. Thanks
https://travel.state.gov/content/travel/en/us-visas/immigrate/the-immigrant-visa-process/after-petition-approved/begin-nat-visa-center.html