Now – you need to work on this, this is what you need to get done to move forward and be successful.
Later – is what you need to do in the long-term, the big idea, the thing that is going to continue making you successful.
The Later can’t be done Now because it’s too big, and the Now can’t be done Later it’s a gap filler and not a strategy.
One gets you over a hump, the other gets you over a hill.