That's good to know, actually. Story's important! Probably keep this on the radar, but wait to check it out until it's more fleshed-out.
The Dev and his team have been constant with updates since 2 years, if it takes other 4 years to complention, I wager to say no.
About the mainstory, well let me put it this way the game is about a Man who is Desert Stalker. and there are at the moment
5 main branches, the Story about the queen, the story about the mutants, the story about the Decayed. the story about the Raiders. and different storys around MC his family and household.
these most probably will flew into each other eventually the content published till now is like 6 to 8 hours of playtime plus it has an open World mechanic where you can replay some of the scenes again and again.