Barometer scoring, so you know you only have a 1 IMP lead.
Not clear if your counterpart at the other table knew the score. But I suspect not (every time we've finished a board, the score has been instantly available, so they're probably a fair bit ahead.)
EDIT: On the penultimate board, your counterparts were in 2 Spades just making on a 6-2 fit with 17 high between them. It makes 3 Diamonds the other way. You duplicated their result. (In other words, you also had a 1 IMP lead with 2 boards to go.)
Would your lead be the same if you didn't know the sotm?
Do you ever lead the 9 from a holding like Q9876? If so, when?
1♣ - P - 1♠ - p
1NT - P - 2♦NMF - P
2NT - P - 3NT - Float