My 6wk old puppy is eating puppy food and drinking water.are they ready to go to its owner

Are they completely weaned? It would be better, and in some places legal, to wait about 2 more weeks.

Nope sorry, there are more reasons for the pup to stay until 8 weeks than just eating well.
Puppies learn a lot of valuable lessons from their mother and litter mates, you should also be socializing the pups to ensure they get the best possible start in their new home.

Plus, as Cats mentioned it is illegal in a lot of places to sell a puppy under 8 weeks of age.

If you have someone who wants to buy this puppy now just explain the them that it is best for the puppy to wait an extra few weeks.

It is illegal to sell puppies under the age of 8wks.

For the mental health of the pup, it needs to stay with its mom and littermates util at least 8wks. This is a very vital time right now. These puppies are learning how to socialize within a group of dogs and learn "dog language"

The puppies may be weaned, but they still need moms safety.

Just hang on for them for another 2weeks at a minimum. You won't be sorry you did it.