Our tomato plants already have green tomatoes on the plant; however, the new fruit blooms are a yellowish green and so are the leaves. I looked for white flies, worms, and bugs and I didn't find anything.
Roma Leaves Around Blooms Turning Yellowish Green
Certified GKH Gardening Expert
Typically, this is brought on by inconsistent watering or a lack of fertilizer. Add nutrients to the soil and make sure the plants are being watered regularly. This article has more info on yellow tomato leaves: https://www.gardeningknowhow.com/edible/vegetables/tomato/yellow-tomato-leaves.htm