Gem for OneNote export To Do tags to a .csv file, and you can open this .csv file by Excel.
If you have a To Do tag list in OneNote page, or a To Do tag summary page, and want to export the list to Excel.
Using "Gem for OneNote" add-in -> "Edit" tab -> "Change" group -> "To Do" menu -> "To Do Tags List" feature.
In the pop up To Do list window, it will list all of To Do tags in this window.
You can read the check status, create date, completion date in this window.
A "Save" button on left top.
Click it to save and export the list to a .csv file.
Now, you can open the .csv file by Excel.
The first column is the uncheck / checked status.