If they do not show fruit of the spirit then it can be assumed that the spirit does not dwell in them and they are still lost.
I don't think it's safe to assume anything about the state of our righteousness. It's safe to assume that we are in a state of grace, but righteousness is another issue.
The righteousness (works) of faith is a "result" of the process.
Our becoming righteous -- learning how to do the "works" of faith is precisely the process. I think you're looking at the process backwards. We were recreated in a state of grace (the end result, if you will). We then learn how to live into that state -- righteousness -- (the process).
We are
all on a path to the Divine. Some are on one path, some on another. Some are not very far on the path, some are very far along. I think we assume too much when we assume that, just because an individual does not "show forth the fruits," that individual is still "lost." The individual may, indeed, be "found," it's just that the individual isn't very far along on the "right" path.