How can the train run on time? :)
The incoming train 12520 was at Jabalpur at 19:30 and will reach Mumbai tomorrow by 1 or 2 pm in the afternoon and then after 4-5 hrs 12519 will start its journey (considering no further delay takes place for 12520)
I am not aware of Tatkal e-ticket cancellation/TDR part but you are eligible for full refund...