That is gray mold and quite advanced also. Your only hope is to spray with the diluted bleach spray and then repeat the treatment in a day or two and remove the leaves that will die after the treatment takes affect. Then use a fungicide. A fungicide now will not stop gray mold. Black tomatoes and GWR tomatoes are the most susceptible to gray mold but I would spray any nearby tomatoes also to ensure it hasn't started on them.
Bill
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