Those are good signs.
I still recommend that you not interrupt the eggs in this delicate phase as they are in lock down so that the chicks can get into position for hatching.
After they all hatch and have dried off, which should give you a couple of days, you can then place the chicks under the hen.
I would recommend using only a red light to keep them warm so they do not become accustomed to bright light to stay warm, or use a heating pad. That way you'll condition them to expect to go under the hen for heat.
Fostering can be more tricky from the chick side than the hen side. Even with mom willing, many incubator hatched chicks are fearful of the hen and try to run away from her.
Place under her tail at night, shielding what you are doing with one hand so that you place in a scoop under her tail with as little fuss as possible.
Then stay by and watch to make sure the little chicks are staying with mum, and mum is fine with it all too. Ideally she'll look at you as this evil person trying to steal her chicks, and the chicks will snuggle down tight.
Check again in the morning after things look good at night. Keep watch over the next day or two. I find escapees happen often on day 2. By day 3, everyone should be happily settled.
Good luck,
LofMc