A patch cycle at 100% means its done. Anything that is 100% completed is done. So why the hell, after sooooooooo much time, it still requires between 5 to 10 minutes of wait after your broken client claims the patch is finished? It has been so ever since its implementation and is still one of the most broken part of it amongst dozens of other problems.
Either learn what 100% means or fix your thing Riot. Waiting for years to fix a problem almost every users encounters at least once per month is the kind of thing an overloaded IT intern would do, in the case of a billion dollar making company, it is outright shameful and humiliating.