Use DETT (Desktop Execution Trace Toolkit) to examine those numbers in your program.
Task manager operates on processes, and LabVIEW is one big process (when it comes to the VI execution system).
You can get use the profiler (or indeed DETT), and IIRC, you can even get profiler data and display that in your application.
What and why do you need this? It makes a big difference if this is a required feature, or a tool for debugging.