Race Comment Explainer

Original comment with matches highlighted:

prominent, pushed along when edged right over 1f out, final

Matched phrases & meanings

Phrase	Meaning
edged right over	This suggests the horse was tiring or possibly ran green
Pushed along	The jockey started to urge the horse (hand-riding, not necessarily using the whip).
Plugged on	Kept going without showing much pace.
One pace	The horse maintained its speed but could not accelerate or quicken.
Furlong	Unit of distance; one furlong is 1/8 of a mile (approx. 200 meters).

Summary

This suggests the horse was tiring or possibly ran green
The jockey started to urge the horse (hand-riding, not necessarily using the whip).
Kept going without showing much pace.
The horse maintained its speed but could not accelerate or quicken.
Unit of distance; one furlong is 1/8 of a mile (approx. 200 meters).