How to check when Shell32.Folder.CopyHere() is finished

I need to unzip en zip some files in my application using Shell32. Right now, I use srcFolder.CopyHere(destFolder.Items()) to achieve this. However, my next line of code requires the newly made ZIP-file. But since the CopyHere method is Async, how can I check when it in finished? Right now I use a Thread.Sleep for around 500 ms which is enough for my computer to finish creating the ZIP file, but it's not good code imo.

Any ideas?

More info/code can be provided if necessary.

I found it, used something like this:

  srcFolder.CopyHere(destFolder.Items())


            While FileInUse(FILEPATH & "BudgetJaarOverzichtSMB.zip")
                Thread.Sleep(100)
            End While

    Private Function FileInUse(ByVal FilePath As String) As Boolean
        Try
            FileOpen(1, FilePath, OpenMode.Input)
            FileClose(1)
            Return False    ' File not in use
        Catch ex As Exception
            Return True     ' File in use
        End Try
    End Function

Not really perfect but will lose less time than with my first approach.