dont worry gomti exp also comes late with fogs arriving here. it will also be equally late if not better. you have a very fair chance of getting the train. keep looking in northern railway website - Under Quick View Heading, look for Trains affected - wil give you some indications on the eastern side trains. (arriving from Kanpur side). best of luck.
IF TN is late by 3 -4 hrs dont worry. you can still board Gomti as it is from New Delhi stn only.