High FTPs? As in a power you could legitimately hold for 45+ minutes?

3 w/kg would be a pretty high FTP for someone untrained, so around 240w?

After a few months of deliberate structured training, I'd expect around 4 w/kg or 320ish watts for a "high FTP". After a year or two, if you were really quite good, I'd expect around 5, or near 400 w/kg. Clearly those people are really quite rare and/or have an extensive endurance background, though, so I most assuredly would not expect anything close to that.

If you're talking about your average person who could lose 20 lbs and hasn't done much more than walk to the fridge in the last few years, than anything between 1-2 w/kg would be expected, so somewhere between 80-160ish watts.

And if you don't have an actual power meter, absolutely none of that matters a bit. Strava estimates or whatever are genuinely useless for this type of question.