Excel stopwatch

I need to time a process at work. Rather than sitting next to the individual i want to give them spreadsheet with Start and Stop buttons and another column to enter comments.

Click of the start button would start the clock and the stop botton would stop the watch and enter the time A2 and reset the clock.

Thanks

This what i have so far. But dont know how to code to enter the results in the spreadsheet and how to reset the clock..

Private Sub Rectangle1_Click()

    startTime = Timer
End Sub

Private Sub Rectangle2_Click()
 
    Dim finalTime As Single
    finalTime = Timer - startTime
    MsgBox Format(finalTime, "hh:mm:ss")
End Sub