on point

Short definition from Wiktionary

Prepositional phrase

1. 1
   Excellent; bold; performing well.
2. 2
   Having a direct application to the case or topic under consideration; apposite, relevant.
3. 3
   On the tips of the toes; en pointe.
4. 4
   Having taken point; responsible for leading an operation; more generally, deployed and alert.
5. 5
   Alternative form of on point.