You have a winner! I found a colony (100+) in a walnut here in Kansas last year and it's doing really well now (250+), huge brood pile, they LOVE the heating cable I have running under their THA Casita, I run that 12 hours a day and off overnight. I didn't diapause them last winter but will put them on a chilly window sill this year now that they are established. They are very light tolerant and have been in room light all year, but recently I did some experiments and the queen chamber is measurably calmer in the dark.... I can tell they start moving around more when I gently move away a piece of cardboard, making sure there is zero vibration. So now the cardboard stays leaning against the glass, not fully dark but much darker than before.
Looks like yours are ready to expand. If they have other chambers to use, if you feed them cooked chicken, turkey or pork they will break it up and farm a field of it where they have room.
Mine also like crickets, meal worms sliced in half lengthwise and occasional raw honey diluted in water.
Good luck and looking forward to updates!