To tell you if the RPM's vs Speed is correct would need a whole lot more info from you.
Here's an easy way to tell if your OD (aka Torque Converter Lockup) is working.
At cruising speed, add some throttle, not enough to down shift, just enough to maybe get from 60 to 70. Watch the tach!! If you get an immediate 200-300 jump in rpm's, the TCC is not locked up.
If the rpm's steadily increase with MPH then the TCC is locked and OD is working.
Hope this helps and welcome to AF.