One of the promises about the upcoming features in the Office 365 business apps session during the Ignite 2018 event was about- Setting reminders in your SharePoint list using Microsoft Flow.
Some amazing individuals have tried to shed light on this topic earlier. So recently MS released this functionality to some of its SPO tenants and the MVP community was buzzing with it ever since.
Important: This feature is available only when you have a date column in your SharePoint list and the view.
You can refer to the articles shared below to gather more about how to set it up and the screen clippings would follow the textual information.
1. Chris McNulty- Sr. Product Manager at Microsoft https://techcommunity.microsoft.com/t5/Microsoft-SharePoint-Blog/It-s-time-for-reminders-in-SharePoint/ba-p/299190
2. @WonderLaura- SharePoint MVP and trainer https://wonderlaura.com/2019/01/21/flow-out-of-box-reminders/
3. SharePoint Developer Community – PnP