The leaves appear to be much wider than 30 mm, the widest in the descriptions in PlantNET and VicFlora. However, I cannot think what else it could be. VicFlora has notes on three allied species - Acacia melanoxylon as above, Acacia implexa, with leaves to 25 mm wide, and Acacia frigesecens, whose leaves are to 50 mm wide but which has branchlets with a waxy bloom. Perhaps wait till there are ripe seeds and pods.