You mean aside from the DART (Double Asteroid Redirection Test) mission already launched, tested, and deemed a success?

    As a part of NASA’s overall planetary defense strategy, DART’s impact with the asteroid Dimorphos demonstrates a viable mitigation technique for protecting the planet from an Earth-bound asteroid or comet, if one were discovered.

https://www.nasa.gov/news-release/nasas-dart-mission-hits-as...

Sure, it's not like we have a fleet of Asteroid Redirection modules lined up ready to go .. but it is an actual capability we have and something we have already done.

This altered the orbit of one asteroid around another. It's moot. You have to either eliminate the asteroid (good luck) or alter it's orbit around the sun (those delta-V numbers just got huge) to be meaningful.

Suggesting we have an "actual capability" is just conjecture. It's a NASA project. According to them, the Space Shuttle was a successful program.