I wouldn’t do just that. See, it’s the same with my back and honestly, it’s become super-impressive only after I started prioritizing lower and mid trap development.

Normal pullups with scapular depression will blast your mid and lower traps. With weights, this becomes hard to do.

If you wanna do only pullups, mix weighted pullups (lat focused) with scapular depression-type normal pullups. Your back will blow out of the window (both width and thickness)