Later in the season, thin out the tomato foliage which will divert the plant's energy into making fruits and not more and more leaves. Towards the end of the season, the plant shouldn't have masses of leaves on it. Be bold, cut them off. At the peak of the growing season, I remove lots of leaves each week when checking the tomatoes. The image shows a trug full and I may cut this amount off, towards the end of the growing season, every week to 10 days. This also aids ventilation, which helps to reduce the risk of diseases.
You may spot a few flowers in the cut-offs. Toward the end of the season, you will have to decide which flowers will come to maturity, and which to sacrifice, in order to get the other flowers and fruits to mature. I often leave any with immature fruits forming and cut off those which are newly formed flowers. It depends on your growing conditions when to consider this. When you feel the season is slowing down, and light levels are starting incrementally to fall, there is only limited time left for the fruits to swell and its better to concentrate a few less fruit as not all will mature.