The phrase "let's see how far we've come" is generally used to reflect on the progress or development that has been made over a period of time in life, emotions, abilities, outlook, or society as a whole. It invites an assessment of growth or change from a past point to the present, often with a sense of hope, inspiration, or realization of achievements despite challenges.

Additionally, "How Far We've Come" is also the title of a popular song by Matchbox Twenty, released in 2007. The song reflects on humanity's progress and advancement, often juxtaposed with concerns about global crises like environmental issues and societal challenges. It questions whether, despite technological and social progress, people will ultimately respond to hardships with courage and cooperation or fall back into destructive behaviors. The song captures a sense of both anxiety and hope, encouraging reflection on how far society has actually evolved and what the future holds.

In summary, the phrase and the song both focus on reflecting on progress, growth, and the journey from past to present, whether personally or collectively as a society.