When you journalize a Recurring Journal Entry, it goes through the standard JE approval flow. There is no delivered flow that looks at the Recurring Journal.
If you want the Recurring Journal Entry to be approved once when it is created and not approved each time it is journalized, a Custom IPA will need to be created to do that.
If you want changes on the Recurring Journal Entry to be re-approved when generated, make sure your custom trigger kicks off the IPA every time the Recurring Journal Entry is released.
You may then want to modify your JE approval flow to exclude transactions with the RJ system code since it was already approved – both initially and when it was changed.