Thank you for your question. Shriveling leaves are due to inadequate water and/or insects such as aphids, which suck on the leaves to get food. Have you examined the leaves for insects? The leaves also appear to be yellowing, typically due to the plant not having enough nutrients (fertilizer). Have you fertilized regularly? Here is an Extension article with tips for healthy tomato plants:  https://extension.oregonstate.edu/news/tips-growing-big-beautiful-tomatoes

Good luck!