I suspect (without looking it up) that Olary never had huge quantities of either goods or passengers in or out. The little traffic offering would have gone to road when that was sealed, at about the same time as the standard gauge line was completed.
From air photos it appears that the old narrow gauge goods platform was not replaced though the goods siding was gauge-converted. It appears to me that the platform was wood-faced and that it has largely succumbed to neglect and the elements, leaving just the two ends - the western end with the crane, and some of the ramp at the eastern end. I'll check when I am up there next. There is little other incentive to stop at Olary any more, with even the pub closed, so, I guess that in time it will finish up like Mingary, a crossing loop and maybe a sign on the road.