I used heat transfer module and solved the variation of temperature verses time. It is easy to obtain thermal gradient at a specific time, but I need to obtain at a specific temperature.
Maybe u can define the cut-point 1d/2d/3d, depending on the geometry u have. Then from the post-processing, in the derived values node, you can select the point and calculate the value at that particular point.
I hope it helps. Let me know if you have any further questions on this.