Manchester City are one point behind Arsenal but it still lacks one more game in addition to the two last rounds so a total of 9 points comparing to gunners which only could collect 6 points.
Manchester City really needs Haaland in his best form. He can achieve some wins for Manchester City, where he can be a deciding factor. His ability to score goals is unprecedented and Manchester City's players are well adviced to search him, to give him scoring attempts and Haaland will likely convert to goals for Manchester City, which Manchester City really needs in such a tight battle.
I believe Haaland will be a deciding factor for Premier League.