I genuinely think it's the dominance and ruthlessness in the games you're winning, and the ability to keep going when things aren't going well which is a clearer indicator of progress.
For all the improvement in league position at Arsenal and Spurs, no one ever felt scared of them while playing -certainly not the big teams. Spurs had that one good season, but apart from that, you always thought that they can be beaten.
I think progress is about instilling a sense of fear in your opponents - I think we had that under SAF, we somewhat developed it post lockdown as well when we were scoring 3,4,5 past everyone every week. You can see the fear most teams had when they faced City a couple of years ago, and you saw the shift in players' and manager's attitude when they faced Pool in the last 2 seasons. Basically, ability to twat any team when at your best and ability to get out something when at your worst would be a definite sign of progress.