we are so much further along

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GoodTaste

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COLLINS: You know, Ari, being NIH director gives you the ability to look across a whole landscape of what's happening in medical research and identify areas that are ripe for a sort of big leap forward. Things like the human project to understand the brain, the BRAIN Initiative, are things that I look at as having been exceptional moments of opportunity to bring together hundreds of scientists to figure out how those 86 billion neurons in your brain do what they do. We've got a long way to go to really figure that out, but we are so much further along because of that...
Source: NPR interview

I don't quite understand the phrase "
we are so much further along" - it seems to me to mean that "(we have walked a long way, but) we still keep going further and further or deeper and deeper along the way." I am not sure. What does the phrase mean?
 
It simply means that they have made a lot of progress, although there is more progress to be made.
 
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