How complete is the early access launch ?

From what ive read in a couple of places, i beliueve the early access launch will have only one of several areas accessible - the reach. Is that correct? Can that area be considered more or less finished?

Whats the status of the game, generally. Is it close to done but just lacking polish? Are large sections unfinished?
Can an approximate completion percentage be given for the game as is?

Here’s the most recent explanation in case you missed it.

thank you, helpful!