You can do this through Windows File Explorer. Add all the Word documents you want to check into a single folder to make the process easier.
Open the folder and click "View" on the ribbon menu.
Then click "Details" on the menu that pops up.
Right-click on "Name" in the heading bar and then select "More".
Scroll down the alphabetical list, tick the "Pages" option, and click "OK".
You'll see a new column on the right-hand side giving the page count of each document.
Then simply add those numbers to get the total page count.