Requirement

Install VMWare PowerCLI

Run the following command in elevated PowerShell

# The line below will install VMWare PowerCLI on current user environment
# Steps below will require internet connection to download the module from online repository
Install-Module -Name VMware.PowerCLI -Scope CurrentUser

Custom PowerShell module

Copy the following into a file located at Documents\WindowsPowerShell\Modules\VM.Statistics\VM.Statistics.psm1.

function Get-VMSnapshotSummary{
<#
  .SYNOPSIS
    Retrieves a summary of VM snapshots
  .EXAMPLE
    PS> Get-VMSnapshotSummary -VCenterServer vcenter.example.com | Select Name, Folder

    This example retrieves VM snapshots summary managed by vCenter
  .DESCRIPTION        
    Version History
    ------------------------------------------------------------------------------------------
    Ver Author   Date        Remarks
    01  Ben      22 Jul 2019 Initial Release with minor adjustment
    ------------------------------------------------------------------------------------------
  .LINK

  .PARAMETER VCenterServer
    Put vCenter address here
#>
  [CmdletBinding()]
  param (
    [Parameter()]
    [ValidateNotNullOrEmpty()]
    [string]$VCenterServer = "vcenter.company.com"
  )
  process
  {
    try
    {
      if(Get-Module -ListAvailable -Name VMware.VimAutomation.Core){
        #Connection to VCenter
        Connect-VIServer $VCenterServer | Out-Null

         Get-VM | Get-Snapshot | Select VM,
                        Name,
                        @{Name="SizeGB";Expression={ [math]::Round($_.SizeGB,2) }},
                        @{Name="Age";Expression={ (New-TimeSpan -End (Get-Date) -Start $_.Created).Days }} 

         Disconnect-VIServer -Server $VCenterServer -confirm:$false | Out-Null
       }
       else{
         Write-Host "VMware.VimAutomation.Core module does not exist. Steps to install:"
         Write-Host "1. Open Powershell in Elevated mode"
         Write-Host "2. Run 'Save-Module -Name VMware.PowerCLI -Path C:\Temp\PowerCLI'"
         Write-Host "3. Run 'Install-Module -Name VMware.PowerCLI'"
       }
    }
    catch
    {
      Write-Error -Message "Error: $($_.Exception.Message) - Line Number: $($_.InvocationInfo.ScriptLineNumber)"
    }

  }
}

Export-ModuleMember -function Get-VMSnapshotSummary

Query Statistics

On PowerShell, run the following command

# Make sure requirement above is completed before running script below
Get-VMSnapshotSummary -VCenterServer vcenter.example.com

Running user (PowerShell client) will need to have connect and read permission from VCenter.