AudiRS6

Agreed. Our case has been stuck on this status for over a year now. 

the cases are already linked, the documents must be uploaded independently by each applicant

There are never any guarantees in life, but they will almost certainly be interviewed together. The fact that the financial documentation fee shows paid is proof they are linked as Wals mentioned. I am just ahead of you with my parents Documentarily Qualified and waiting for the interview, which is on hold due to the immigration ban.

Good luck!

I have some good news too!! After months of waiting My father’s case has been approved today ☺️☺️☺️ I thought it will be a 2yrs wait since his case was transferred from Nebraska to Vermont. I am now just waiting for the NVC email. I am so glad we can move on to the next process now both for my parents, since I have not started my mother’s case yet at NVC. Hoping to hear more good news from all of you ☺️

Good news!
My dad's I-130 has finally been approved today. 
The date on the approval notice is 9/3, but it only showed up today along with the approval status change. 
His approval notice was issued from TSC even though his receipt notice came from NSC (I was aware of this transfer because I called USCIS few weeks ago asking about the current service center processing his case).
We didn't receive the NVC welcome email yet.
And we've been holding on completing my mom's NVC process until receiving dad's I-130 approval, so they can go through the NVC process together. Thankfully both I-130's were smoothly approved despite the 126-day gap between them. 
Hoping for IV's to become available again by the beginning of 2021.