PSM could probably provide this information -- I'm no expert there.
That said, in Windchill 10.0 and higher you can find something like what you're looking for in Windchill/wtcore/jsp/jmx/javaProcesses.jsp. This page can be used to search for historic data akin to that on the server status page's charts for both current and past processes. Each process is shown with a "Last Known Alive" time which is the last time data was written by the process to the built-in health and performance monitoring tables.
Of course I'm not really sure exactly what you're looking for here. While each process has an uptime, i.e. the time it remained alive until the current instance in time or its death/exit, when one considers multiple method servers and (in a cluster) multiple server managers and multiple restarts, I'm not really sure what you're looking to report on.
The JSP page in question is backed by simple, non-modeled tables -- and the source is all in the JSP file for anyone wishing to read it.