McGerm wrote:

Can I plant these out into the yard now here in PA if I keep them well
watered? If not now, when?


the sooner the better. They have a tremendous taproot which is now
severely confined, so you are weakening them. Oaks, as well as
chestnuts, are best planted directly from seed. Choose their final
location now because they can not be replanted elsewhere (due to said
taproot).