Was the "homework" for H only or for you two as a couple? If it were for your H only I can see letting it go until your ST session, if it's for you two as a couple...you need to say something about the undone homework...because you would have a responsibility to it too.
I understand you said it was up to him to set a time and that he agreed to it, BUT having said that...you CAN remind him, he hasn't lived up to it and he STILL needs to set that time the clock is ticking away.