Uninvoiced Time Finder
When you look at the list of invoices by month, you can build a monthly time report to find what projects are not invoiced. To build the report, just click the Build Time Report button on top of the screen.
After you build a monthly report, the list of uninvoiced projects will be located under the invoices list. You can mark uninvoiced projects by ticks and create an invoice right from this screen:
Building a monthly report on heavy Jira instances with many users and projects may require making hundreds of requests to Jira. So this report is not updated automatically. You need to manually rebuild the report if you have put some changes in the invoices or know that time logged in Jira was changed.