As of a few minutes ago, they are doing well and have already imprinted
to Ms. Rock,
Mom hens and chicks imprint, bond, before they hatch. She clucks to
them through the shell.
On grass is good. Ideally there is some dirt so she can show them how
to scratch. Chicks on dirt and grass with mom hens are much healthier
than incubator chicks and likely get resistance to disease from the soil.
Feeling a bit like a mother hen myself,
Don't forget to cluck to them when you provide groceries.