Open your workbook in Excel. Press Alt + F11 to open Visual Basic Editor (VBE). Right-click on your workbook name in the "Project-VBAProject" pane (at the top left corner of the editor window) and select Insert -> Module from the context menu. Copy the VBA notify code and paste it to the right pane of the VBA editor ("Module1" window). Or just download and add the notify.bas file to your workbook.
toast (titleMessage, [infoMessage], [flagOfMessage])
None = 0
Information = 1
Exclamation = 2
Critical = 3
toast "Hello World", "from Excel",1
It is possible to use emojis such as 😍
Just convert it to chrW code
toast ChrW(-10179) & Chrw(-8691), "from Excel"