レストランの料理は - dishes
料理を出す - dish has come , dish has gone out
まだ - still, more
まだ出す - more coming, more to come
まだある - there is more, not finished
まだ続く - will continue, not finished
料理はまだ続きがあります - the dishes haven’t finished coming yet, there are more dishes to come, after this there are still more