To do Alt + M W on Mac in Excel, download and install Accelerator Keys, then press Option, followed by M, W.
Command: Watch Window
This is how to do Alt + M W 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 + M W opens the Watch Window in Excel. This floating window lets you monitor the values and formulas in specific cells, even when you’re working in other parts of your workbook. It’s invaluable for tracking key calculations while editing data elsewhere in large spreadsheets.