MAGA might as well start yelling fraud right now. They have zero chance.
On fundamentals alone:
California voter registration is roughly 45% Democrat and 25% Republican.
Democrats have won every statewide gubernatorial election since 2006.
Gavin Newsom won reelection in 2022 with more than 59% of the vote.
So if I were translating the available evidence into betting odds today, I'd estimate something like:
Candidate Estimated chance
Xavier Becerra 75–90%
Steve Hilton 10–25%