You should be fine. Grasshoppers typically don't eat tomato plants. Tomatoes are part of the nightshade family, and their leaves are toxic to most insects. Horn worms are what you need to watch out for. They will eat an entire tomato plant in a day or two.

Here is a link that might be useful:

Dallis_rene, you can pick tomatoes when they start blushing (getting their first pink or other final color). Most people agree picking them when they start ripening and then letting them finish inside improves the texture, and provides less opportunity for critters to go after them.