Append timestamp to powershell
You can add a calculated property to you output like this

Get-Process | Sort CPU -descending | Select -first 10 @{l="Time";e={get-date}},ID,ProcessName,CPU


The syntax for adding a calculated property is

 @{                  - start a script block
   l = 'label';      - choose a label for the property (not mandatory)
   e = {expression}  - formulate the expression you like evaluated
 }                   - close the script block