To do Alt + H L H G on Mac in Excel, download and install Accelerator Keys, then press Option, followed by H, L, H, g.
Command: Highlight Cells Greater Than
This is how to do Alt + H L H G 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 + H L H G creates a rule to highlight cells with values greater than a specified number. You can choose the highlight color.