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It's almost ready...again.
It will not launch in 2018, but will (hopefully) lift off in 2019.
Nothing is guaranteed; any rocket can explode; provided it gets "out there" deploying the telescope will be a delicate matter; oh yeah, if anything goes wrong there is no plan/budget or support to fix it (yet).
All that aside, this will let us see further, better and more than anything else we have ever done :jumping:
https://www.scientificamerican.com/a...o-big-to-fail/
JWST will allow us to "see" the infrared signs of early proto-galaxies. However, don't expect dazzling visible light images like the "Finger of God" picture that was possible with Hubble. The cold hard data will be incredibly important and one of a kind, but like LIGO's audio of two black holes merging, the public probably will ask where the $9 billion went. Astounding visible light images may get a rebirth if the Hawaiian gods ever allow us to build Extremely Large Telescopes on their sacred mountain tops. :)