Once enroute, and at altitude, selecting FPL / VIEW / WIDE and CUM should do the trick. If you have yet to activate your approach (which is likely), the ETE won't be correct as it will not have included the time to execute the approach. The above will assume DCT to your destination airport from the termination of the STAR if one exists. I rely on SIMBRIEF for estimates when planning and prior to FPL entry. Good luck.