GNSS vs Total Station and True North?

When using GNSS equipment (base & rover), True North is obvious.  But how do you align and set a total station (i.e. old Leica TCRA1103 Plus) to True North?

I can use a cell phone and "roughly" align the total station using that using either True North or Magnetic North, but what is the proper way to align the station exactly to True North best as possible please?

Thanks guys!