sophie don't keep the chicks in the incubator without food and water for too long it will delay their development.
If you have a fan in the incubator the chick will not be able to rest well either. A brooder should be ready set up straight away so any newborns can be added after 2 hours of hatching. 2 hours to get on their feet and dry a little but any longer is just detrimental. They can survive for 24 hours without food and water but avoid delaying moving them, do it as soon as possible.