Thank you for your interest in G Suite Add-ons. As of February 4, 2020, G Suite Add-ons are generally available. You can check out currently available G Suite Add-ons at https://gsuite.google.com/marketplace/category/works-with-gsuite and learn more about building add-ons at https://developers.google.com/gsuite/add-ons/concepts/types#g_suite_add-ons