At this point in the growing season, you should be beginning to see flowers on many of your summer vegetables. Here are a few photos to let you know you are on the right path.
By the way, botanically speaking , cucumbers, as well as, eggplants, peppers and other plants that produce a flower and then pollinated are classified as fruits. They are seed producing. However, much like tomatoes and squash they are often perceived, prepared and eaten as vegetables.
Hope these are helpful!
Flowers , but no fruit yet
Beans and Eggplants