Hello my friend
It is clear that your plant has a slight deficiency but it is useless to panic or even to make an accurate diagnosis of the deficiency because it is anyway too late to do anything to rinse well by your plant
She is not far from ready to be harvested. Water it with a water have PH 6.3 or if you can with rainwater it will be the top
Your plant is still beautiful and will be harvested before the deficiency will hurt him
May the force be with you