Overhead memory for all VM's

I am using method mentioned below by william Lam for pulling report of overhead memory. It works great for a single VM however when i try it for all vm's  it just populate

data on the screen and do not export it in the export path file.

http://www.virtuallyghetto.com/2016/01/easily-retrieve-vm-memory-overhead-using-the-vsphere-6-0-api.html

Command using for exporting overhead memory for all  the vm's

Get-VM  | Get-VMMemOverhead | Export-Xlsx  -Path D:\overhead.xlsx -WorksheetName HA

It shows the result in the screen but do not export.

Best Regards,

Deepak Koshal