That hasn't yet been decided, but that's not even the point.
edit: so i've now been rate limited for posting three things. What the posters beyond assume is not what I meant. I'll not be able to answer for about two days or so. nice
Yes, we still have the lawsuits to go through, states must certify their results, and the electoral college must meet on December 14. In other words, the exact same process that happens in every other election (obviously the lawsuits are a slight wrinkle) There's a tiny, tiny chance the results could be changed.
Did you also go around insisting that the election hadn't been decided yet after the media called it for Trump on election night 2016, or are you only doing it this time around because he lost?