I think it's safe to presume that Iran hasn't retaliated yet, and likely won't retaliate in any direct military way, because that's exactly what Netanyahu wants them to do - that was the entire point of the assassination in the first place.
Though Iran arguably loses face by not diectly retaliating, they'd likely lose even more face by allowing themselves to be provoked into doing what Netanyahu wants them to do.
Alongside that, it's safe to presume that they will retaliate at some point, but it's going to take a form that conveys a clear message to Israel and to Netanyahu while not being the direct military response that Netanyahu was trying to provoke, so won't give him an excuse for the war he wants to drag the US into.