Supreetha J
In Fluent, the export of data on a point needs to be done via a surface monitor during run time as the calculation proceeds.
To do this:
1. Create points at the desired location via Post-Processing Results>>Create>>Point
2. Go to Monitors and create a vertex average points and select to write the data to a file, with desired variable.
Note that this needs to be done before the calculation starts, in run-time when the calculations are running. 
To get the physical time, select the flow time in the x-axis.
Hope this helps!