We have had some very high temperatures lately so some leaf damage is not unusual on lots of different plants.  Vulnerability to this type of damage is determined by leaf age, position on plant, and orientation to the sun.  The most important thing is to be sure you are watering the plants enough and they are not drying out. If so, the plant should be able to put out new growth with no problem. If we continue to have high heat and bright sun, you may want to consider using a shade cloth over the plants.

Here is some more information on heat stress in tomato plants that could be helpful.
https://extension.psu.edu/heat-stress-and-tomatoes

Robin