Do you meand that God both declares us righteousness and makes (is making, will make) us righteous? If so, I agree with you. Would you also agree that a problem arises when we either believe 1)that God is content to leave us as we are; or 2) that Christ' righteousness is not ours until we have become righteous on our own.
Yes, there is a now and not yet to our righteousness. At the same time, I'm hesitant to say that God is in the process of making us more and more righteous. Throughout our lives we are 100% sinner and 100% righteous. We never escape from that dual nature. At the same time, we can improve in our "civil righteousness." That is, better willing and able to show love towards neighbors (and enemies). Better willing and able to stand up against injustice, etc. Perhaps to phrase it differently, we can act more and more like the perfectly righteous person that God says that we are in his sight. "Become what you are!"