Listening DPA about the "super special military operation"
https://yewtu.be/watch?v=T7E-Mv7yUm4
He says the Wagner camp/HQ was in Lugansk, perhaps towards north. So they could reach Voronezh not that long after they were done in Rostov.
They also hold Donetsk somehow. I'm breddy sure they have more than one camps.