Q.Should You Use Row Cover On Tomato Plants?
These are in raised beds and the temperature gets to about 90

Certified GKH Gardening Expert
Row covers for vegetables are helpful in preventing pests on the plants. However, they need to be removed at some point to allow pollination. They also can provide shade or prevent a sudden temperature drop. At temperatures of 90 degrees, tomatoes won't set fruit. If you use them for tomato plants, lay the cloth over support hoops to keep the cloth off the plants.
Here is more:
https://www.gardeningknowhow.com/edible/vegetables/vgen/row-covers-for-garden-plants.htm

Certified GKH Gardening Expert
Row covers for vegetables are helpful in preventing pests on the plants. However, they need to be removed at some point to allow pollination. They also can provide shade or prevent a sudden temperature drop. At temperatures of 90 degrees, tomatoes won't set fruit. If you use them for tomato plants, lay the cloth over support hoops to keep the cloth off the plants.
Here is more:
https://www.gardeningknowhow.com/edible/vegetables/vgen/row-covers-for-garden-plants.htm