I believe his shiur is actually after shachris, but I could be wrong as well. He’s almost inpossible to get a hold of. With Rav Elyashiv you will need “protexia” to get into him.
I don’t know if Rav Mordechai Gross gives any regular shiurim, but he’s all over the place. He has numerous beis dins, and answers shailos in numerous places.