
I usually allow visits as often and as soon as people want, pointing out that until 4 weeks they won't really be that interesting and characterful.
Those travelling long distances therefore visit at that stage, so outdoor visits would be entirely practical, unless you have tiny/short coated breeds.
These days with tech they will have been getting not only update photos from birth, but short vids too.
I hope to get lots of pics and vids of the hoped for litter I hope to have a pup from. I bred the Mum.
As I am Wiltshire and would be breeder Yorkshire I probably won't visit until pick up, as litter would not be born until at least mid December, and of course I know the bitch, her owner and the stud personally.
It will be strange after 29 years to be in the buyers shoes.