It is better to do something average than to wait until it is too late to do something spectacular.
I actually made that up, and I don’t mean to imply that you should aim for mediocrity. It’s certainly best to try to always do something spectacular. But sometimes I find myself spending forever trying to get something “just right,” before I realize that whatever I’m working on is losing relevance.
I can’t remember the source, but someone once told me that a book is never finished, but that the publisher eventually forces the author to send it to the presses.
Work towards something spectacular, but don’t lose sight of the fact that something spectacular that never gets released is, essentially, nothing at all.
There are a number of similar expressions along the lines of “a good plan executed at the right time is better than a perfect plan executed too late” that are common in military writings. One of them may actually be in “The Art of War” which is of course an ancient Chinese writing but it has been a while since I read it.
Computer programs are also never really done. A line is drawn and someone says “ship it now.”