So far, 11 asteroids have been discovered before they impacted Earth, 4 of them in 2024:

https://cneos.jpl.nasa.gov/pi/

https://en.wikipedia.org/wiki/List_of_predicted_asteroid_impacts_on_Earth

This resolves to the number of such detections in 2025 (UTC); the impact can happen later. Anything coming from beyond Earth's sphere of influence counts (asteroids, comets, interstellar objects, old rocket stages returning from heliocentric orbit...). Groups of objects traveling closely together (e.g. binary asteroids) count only once.