if you in winning position you must be familiar with +M1 (white) and -M1 (black) the M1 will appear if your opponent making a blunder or his winning metre drop to 0% that mean you get +M1/-M1 and if you get M1 or M2 its mean just 1 or 2 more move left to win and if you win you will get M0, M0 its mean you win the game because you found the checkmate move
Yeah, but M0 is not, it just says 0-1 or 1-0.