Puppies on board!

My awesome JRT Lucy is pregnant with 4 pups due in about a week or so. Already we have people lining up, saying that they want one of the babes. I was looking online and, of course being the wealth of too much information that it is, I got conflicting information about at what age they can go to their new homes. I understand that they need to be done nursing and eating solid food, but other sites say that it depends on the breed - so what about JRT's? Please help out! Thanks!