I have been on this diet without cheating once for 2 weeks. How long does it take diet to eliminate acne?

I'm 47 and it still doesn't seem to work.

My diet:

Skinless chicken breast and seafood, mostly salmon

I eat veggies, mostly broccoli, cauliflower, and spring mix.

I add avocado and apple cider vinegar to my salad.

I only eat brown rice for my carbs, no oatmeal.

I only boil all my food, no pan sear or roast.

I don't add any oil to my food.

I don't eat dairy or fruit or sugar or nuts.

The fats I get are from salmon and avocado.

I read it could take 2-8 weeks for a pimple to form. So in theory if I had a perfect diet for 8 weeks, I shouldn't get acne?