My best’s are something like 606w for 1 minute and 389w for 5 minutes, from about 5 years ago when I paid a lot more attention to my numbers and actually trained, thats with a 20 min best of about 312w.
Peak power was around 1320w IIRC and did 5 second max of about 1100w.
Those values got me to 2nd cat, winning 4 out of the 5 crits I entered that season, including a 2/3/4. I didnt get any top 10’s in road races though, always survived the cut but tended to dip out on the final climb. Thats all at about 72kg.
I reckon I know a couple who could do 500w for 5 mins, but they are big guys. On the return to Pollenca last year it felt like I did 500w for 5 minutes just trying to sit on the wheel of one guy!
506w for 3 minutes is seriously good too, assuming of course your exercise bike is accurate, which is a big assumption.