Last year I had a cockerel who was so lightly-built and poor type that he was managing to fly with all of the primaries on both wings cut.
Fortunately, Ludwig was a tolerant rooster.
Clipping wings is a perfectly safe procedure that can be done at any age when the feathers are fully grown in.
https://www.backyardchickens.com/articles/wing-clipping.76982/
The key thing is to not cut any blood feathers -- the still growing feathers that have blood in their shafts. IF you...