Agree, prune and keep track of future developments. Hope you are spraying regularly with some kind of fungicide.

if you haven't already, once tomatoes set fruit it's good idea to give them fertilizer with slightly higher nitrogen.. not implying your leaves are yellowing due to lack of nutrient, as there are several things that can cause it.. but if i had to guess, it's one of the reasons.

Thanks to the addvice, I have this plant a 9-3-6 fertilizer last week.

I waited to see the results and I'm seeing more browning and leaf death but not as much overall yellow. It doesn't look like one leaf shriveled up (pic below) and I'm not sure if it's related but one of my green tomatoes had a hole in it (possibly unrelated). I'm including pictures below and hopefully this updated info can help someone offer me more help.

Thank you

For what it's worth, this is all happening at or near the bottom leaves. The top of the plant and most of the middle is a good color green, like this.

Is the plant in-ground?

Raised bed garden @gorbelly

Are you sure you're watering enough/water is getting to the root zone effectively? It really looks like drought stress to me.

At any rate, aside from double-checking your watering and adjusting it if necessary, all you can do is keep pruning off affected foliage and spray fungicide regularly.

The fruit looks like it has BER. It can occasionally occur on the side of the fruit, and I think I see signs of it internally at the bottom as well. This would support a problem with watering.

The leaf in the third pic is wilted because it's broken. Probably damage from a storm/wind, an animal, or even from you as you work on the plant/tie it up/etc.

I really think this is all an issue with watering.

@gorbelly

thank you.

Mother Nature will be dropping about 2 inches of rain slowly and constantly all day today. Hopefully that helps and I will reassess. Thanks

FWIW, my experience with drought stress is that appearance of yellowing and browning is often delayed by a few days from the stress that caused it. If I walk out and see that my plants are wilting, I water them, and they seem to perk back up fine. But a few days later, the leaves that were most wilted will often start to show browning and yellowing after the fact.

the plant also looks leggy(that might not be the right term). As my other tomato plants are full almost like a bush. This tomato plant seems to have larger gaps between the leaves and fewer leaves. This could be underrated. Thanks

That looks like a different problem than your original. Looks like bacterial speck, perhaps taking advantage of a weakened plant.

I like Serenade against bacterial speck. It seems to work a little better for me than copper against this particular disease. But you may want to use copper, as it's more effective against more diseases. Nothing will cure the plant now, only slow down disease progress.

Speck is typically slow-moving and you can usually keep a plant going until frost if you spray regularly and prune off diseased foliage diligently.