Winning chance is basically 0.0% against current strong engines for a human. There are possible draw lines but if engine is configured correctly draw chance is also 0.0%
As some other commenter calculated Stockfish wins in about ~>98% of the cases. The other ~<2% of the cases aren't Magnus winning, rather them drawing. I think no GM is known to beat a modern competitive AI in chess, however there are known/recorded instances of draws.