Cruising and Climb Speed

Under some aircraft, the overspeed speed would be 350kts, mostly in airliners. However, sometimes. I would see people cruises at 493kts at 34000, is this correct? And if yes, wouldn’t the alarm just go off continuesly?

Additionally, when climbing would the speed be Vy or V2 or some other speed?

You see GS on the trackers, you’re talking about IAS. Climb speed depends on lots of stuff I’m sure there is a topic on here somewhere.