In general, the ground / neutral bond is made at the first overcurrent device. So, if the meter has a main breaker (or fuse) as a disconnect, then that's where the two are joined. If there is simply a disconnect - no breaker until you get to the panels ... then the bond is made at those panels.
Finally, let's not get confused about that little green screw. All it does is bond the box to the neutral bar. If you have a separate ground buss, you really ought to have a wire connecting the busses together. I believe the 08 actually says this ... but it seems logical; I wouldn't expect that screw's connection to be reliable enough to use it as the only means of carrying the full fault current of a circuit.
