This is using Get-CimInstance -ClassName Win32_NTLogEvent

Category         : 1
CategoryString   : Windows Update Agent
EventCode        : 43
EventIdentifier  : 43
TypeEvent        :
InsertionStrings : {Update for Windows 8.1 for x64-based Systems    (KB3118401), {a9405868-c0fb-44dd-b13b-ab595d85d6df}, 201}
LogFile          : System
Message          : Installation Started: Windows has started installing the following update: Update for Windows 8.1 for x64-based Systems (KB3118401)
RecordNumber     : 17648
SourceName       : Microsoft-Windows-WindowsUpdateClient
TimeGenerated    : 13/03/2016 4:31:09 PM
TimeWritten      : 13/03/2016 4:31:09 PM
Type             : Information
UserName         :