All seven instances of 'he who overcomes' in Revelation is actually in the present participle (meaning: the now in action (he is swimming at the moment)). What does this mean? Inasmuch as, 'He who IS sanctifying and those who ARE BEING sanctified are one', and if one understands that that sanctification is 'in the process', so also, the ones who IS OVERCOMING are given the promises attached to those 7 verses. The promises of such as: the right to eat from the Tree of Life, never to experience everlasting spiritual separation from God, heavenly manna (the food of angels), a new name (who we shall be), cloth of white linen (gloried), authority over nations, etc...
So, if we are overcoming, then we have hope given to us in promises and in patiently waiting faithfully, we continue looking forward towards the full manifestation of the Son. How wonderful is our living God.