Here are the davening times for Shabbos Hagadol:
Mincha Friday evening: 7:35pm
Shacharis Saturday morning: 6:30am*
Mincha Saturday evening: 7:40pm
Ma'ariv Motzei Shabbos: 8:45pm
*Please note that Chametz may be eaten until 10:40am on Shabbos morning, as a result, davening must be early enough for two meals to occur before that time.