The phrase "let's see how far we've come" generally refers to an assessment or reflection on the progress or development made over a period of time, particularly in life, abilities, emotional state, or societal progress. It often implies looking back to understand how much growth or change has occurred, sometimes in the face of challenges or adversity. This phrase can be used figuratively to evaluate personal, social, or technological advancement and encourages seeing beyond current difficulties to the progress achieved.

In popular culture, "How Far We've Come" is also a song by Matchbox Twenty released in 2007. The song reflects on the state of the world and humanity, particularly during tough or apocalyptic times, questioning how advanced society really is after experiencing hardships and crises. It invites listeners to reflect on human progress amidst environmental, social, or existential challenges, combining a message of both concern and hopeful assessment of humanity's journey.

Therefore, saying "let's see how far we've come" can be an invitation for reflection on achievements, learning from past experiences, and recognizing growth or change despite obstacles. It encapsulates a mix of evaluation, hope, and sometimes a critical look at progress made.