The Captain Sim 767 (and 757) are not very good at predicting the arrival times in their current versions (they did used to be pretty good).

But on the other hand, when the arrival time at each waypoint is the same, it usually means that the T/D has not been calculated, or the final waypoints (STAR/TRANS) is missing. I have done a couple of topics to cover way around these two problems:

Fix for missing T/D in CDU/FMS

Fix for missing end of route

You can check them out to see if they help.