The second line in the table at
has all the Fusion manuals. For instance
is what you are looking for in the Python case. In any case we at Mosek are not aware of any other documentation.
A Fusion model cannot be converted to an optimizer API model automatically....
Which options to use
The problem is that the "time limit" is not handled by Pyomo (which just connects to a solver), but by the solver itself. Different solvers have different names for "time limit" options. See this StackOverflow post about that. The timelimit option you're setting above would work for CPLEX, but maybe not for GAMS (see ...