It depends on why the plants are hermaphroditic. If the plant produced male flowers as a result of stress there is a good chance that most of the progeny of the self-cross will be female. If the hermaphrodism is a hereditary trait some of the plants will be female and some hermaphrodite.
Unless you have had experience with the particular plants you are growing, there are few indications whether the plant is naturally hermaphroditic or is as the result of stress.
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