[The Louiswu]

..."when will we see pictures of the exoplanets showing evidence of life..."

The next generation of space telescopes will be several orders of magnitude more powerful than the JWST, MAYBE...just MAYBE they will be able to image exoplanets with enough resolution to identify some surface features...I'm 63 and I doubt that will be during my lifetime, I'll bet if you're in your 30's right now, you'll live long enough to see some really exciting things captured by space telescopes.

[fso301]

Scientists have been promising the imminent detection of extraterrestrial life since at least the Martian canals hoax.

In NASA's own words from a 2016 crawl stored by the Wayback machine:

"Data from JWST will be used to study the formation and evolution of habitable worlds, and will be invaluable in understanding processes that have shaped habitability in our own Solar System. JWST is capable of making detailed observations that might allow astrobiologists to identify signatures of life on Earth-like planets beyond our Solar System."

https://web.archive.org/web/20160703200716/https://astrobiology.nasa.gov/missions/jwst/