That's correct, though
@lovinglife makes a good point that some food can spike you later.
I'm a dexcom user and I dearly love my dexcom but be aware that you do need to check cgms occasionally against a glucometer, as sometimes a sensor can be "off" and they don't always read accurately at high and low readings (hopefully not an issue for you as you are not on insulin and have a relatively low diabetic hba1c).
The dexcom g6 is more expensive than the libre, but they have a new dexcom one (missing some features that I think are only used by insulin users on pumps) which is comparable in price. (I'll probably switch to it if/when it becomes available in New Zealand, though only if the accuracy is as good. )
Good luck.