Okay, so this was anticlimactic.
This "march" was done as a form of protest. It was basically a prank, although some Wagner forces did die in air strikes along the route as well as some aircraft were shot at. It was all for Wagner to earn more money and other benefits before they go back on the offensive in Ukraine.
I don't know if Putin's martial law will continue, completing the psyops, but this wasn't a purge or a coup, or anything for that matter. Just a waste of a day and some unnecessary deaths, although Wagner might not think of it that way.