Hi
On the default version of Telemac this is impossible.
By a manual adaptation of the subroutine telemac2d.f I think it's possible.
I think 2 or 3 years ago to implement a similar functionality (read an hydrodynamic result and compute only the transport) but I don't found the time for that.
In your case, the idea is to shortcut the computation of the hydrodynamic step when the steady state is reached.
Hope this helps