I doubt Harris will run much if Biden is elected. That has not been the traditional VP role. It´s paranoid republicans talking, while trying to paint her as a communist.
Biden will continue to rely on the crowd who has been around him all the time, and only start grooming Harris to win the next election when it approaches.
Also - Harris was not a strong candidate to begin with, nor does she have a strong base in the Party. I think she will be challenged from within the democratic party, if a new strong profile appears, unless she handles herself really well with the issues that Biden will allow her to deal with.