We get results from Riot's API every 10-20 minutes for the ladder so your score will most likely update soon. If it has been longer there could be a temporary issue with the connection which will resolve itself if you just wait a little longer - you will get your points!
If you still haven't gotten any scores after more than an hour, I recommend to doublecheck the match result on op.gg to verify that is has been reported there. If they have the result but we don't this is likely because you joined the game in LoL before you joined the ladder. This may then cause the ladder to not recognize your game. Make sure to join the ladder first before you enter the LoL Solo Queue.