You can create a report that lists all of the form submissions for a selected date: https://docs.kentico.com/k11/configuring-kentico/working-with-system-reports/creating-reports
Dražen's suggestion of using global event handlers could help if you're looking to store that information elsewhere or send the submission to some other application. You can also use the Integration Bus: https://docs.kentico.com/k11/integrating-3rd-party-systems/using-the-integration-bus/creating-integration-connectors/implementing-outgoing-synchronization
Though, using REST should be fine too.