Watch what happens. As your concentration deepens you will have less and less trouble with monkey-mind. Your breathing will slow down and you will track it more and more clearly, with fewer and fewer interruptions. You begin to experience a state of great calm in which you enjoy complete freedom from those things we call psychic irritants. No greed, lust, envy, jealousy or hatred.
Agitation goes away.
These are beautiful, clear, blissful states of mind. They are temporary, and they will end when meditation ends. Yet even these brief experiences will change your life. This is not liberation, but these are stepping stones on the path that leads in that direction. Do not, however, expect instant bliss.