Hi there, 'prestige = current_score/br_100_score'. Should give you an indication of how far away or how far past BR100 is -> more simply it is Progress to Br100. Say if my prestige was 3.0, I could say that I've hit Br100 3 times.
Seems to be no easy way to predict score after 100 so I thought this could be a more relevant alternative :)