Yes so looking at the westbound services (i.e. those towards Chicago) from January it would seem that delays of fifteen/twenty minutes are quite common even up to half an hour isn't that rare. But multi-hour delays are much rarer looking but when they do go wrong they can go wrong. There were a couple of four+ hour delays in there! Though, to be fair, early arrivals are quite common sometimes even ten minutes or more.This site collates running time that can be searched by train and station https://juckins.net/amtrak_status/archive/html/history.php
While small delays seem pretty common, it isn't a line that regularly gets the huge disruption the long distance routes out of Chicago suffer from.
As much of the route is on Amtrak and regional authority owned lines rather than freight company tracks it should be less prone to these issues than most.