The phrase "a true highlight" is correct and usable in written English.
It can be used to emphasize a particularly significant or memorable moment or aspect of an experience.
Example: "The concert was amazing, but the solo performance by the lead singer was a true highlight of the evening."
Alternatives: "a real standout" or "a genuine peak moment".
A true highlight of the weekend, the magical experience repeated on Sunday.
Dyker Beach has long since been cleaned up, and the sight of the Verrazano from the seventh hole is a true highlight.
Kevin Mitchell So many to pick from in a quite remarkable year for rugby league, but the night where the League Leaders Shieldd was settled back in September was a true highlight for me.
It is a breathtaking drive there – a stop to walk across the suspension bridge at Corrieshalloch Gorge is a true highlight – and in the time since the road was widened, the Ceildih Place (bunkhouse double rooms from £62 B&B, en suite doubles from £150 B&B) has evolved into a beautiful hotel, excellent restaurant, respected venue and well-stocked bookshop.
Lennon's performance of "Imagine" was an inspired moment and a true highlight of the evening.
The climax takes place inside a mountain of pixum, yet the true highlight is Jackman, a splendiferous blend of the wheedling, the mournful, the murderous, and the throwaway.
It was a pretty underwhelming bunch and so I was happy to see Amazon release a few true highlights before the year's end.
Those elements were present in a massive Beijing press conference held earlier today (including a trio of new smartphones that have done away with the headphone jack, in favor of USB-C), but the true highlight came when a visibly emotional CEO Jia Yueting unveiled the LeSEE concept car.
Walking out of the film session after it ended, Donaldson said his presentation was something short of a true Mount Union highlight reel.
