Puppies are all different and could need to go poop at different times.
I've known some puppies that will need to go poop 6 minutes after eating while others could go up to 15 to 30 minutes after eating before they needed to poop.
Be prepared to take your puppy out to poop within 5 to 15 minutes of them eating anything since that's how long after eating most puppies need to poop.