For a sub panel under the old 3 wire system or a main panel, yes that Neutral must be earth grounded somewhere (connected to a No. 4 bare copper GroundING Electrode Conductor wired to a GroundING Electrode such as a driven rod or rods etc.), either up near the weatherhead riser or in the meter base or in the main service entrance panel.
The panel in the picture (assuming the Neutral is already earth grounded somewhere like one of the three places above) simply needs the addition of another buss or two busses tied together to be used as a common Neutral/Ground or one Neutral one Ground but bonded together with a cross tie bar.
Without doing the voltage drop calculations that length of run don't sound bad but Id have to know the amps and distance and wire size to plug it into a calculator.
Glad to help, I havent seen you since years ago when we all met at New York Expo as I recall.
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