To do Alt + T on Mac in Excel, download and install Accelerator Keys, then press Option, followed by T.
Command: Switch to Automate Tab
This is how to do Alt + T on Mac in Excel with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with Excel.
Alt + T switches to the Automate tab in Excel’s ribbon. The Automate tab provides tools for creating and managing Office Scripts, which allow you to automate repetitive tasks in Excel for the web and desktop.