Get last boot time from a list

I was asked to reboot 60 some servers just because someone thought they hadn't rebooted in forever.  Being a skeptic I had to verify so I put this thing together from some googleing I did.

First line pulls in a list of machine names.  Second line makes the WMI call then the select.  Last line exports to a CSV.

$ComputerName = Get-Content -Path C:\temp\computers.txt

foreach ($Computer in $ComputerName) { Get-WmiObject win32_operatingsystem -ComputerName $Computer |

       select CSName, @{LABEL='LastBootUpTime';EXPRESSION={$_.ConverttoDateTime($_.lastbootuptime) } } |
   
              export-csv "C:\temp\Computers_LastBoot_Results.csv" -NoClobber -NoTypeInformation -Append

}