Create a .txt file with all of your server name and save it in a safe location, like C:\ServerList.
Copy the above script and update it with your desire location for the output file, Like C:\HardDriveSpaceDetail.txt
Attached that file to your email and send it to your boss. I used Gmail as the SMTP, but you should use your corporate email service or SMTP.
Create a windows task to run the PS script before you have your morning coffee.