Those yellow leaves are from too much water! I need to build that area of the garden up a foot or so for the next years crop. That row of maters are the beefsteak, yellow lower leaves or not, they are LOADED with fruit!
Mine are already in a raised bed, but we’ve had unpredictable weather this year. It’s either been drought or a deluge. My tomatoes are also loaded with fruit, and it seems to ripen nicly. I’m not too concerned about the loss of leaves because too many leaves leave too many places for the mosquitos to hide.