How to detect specific time in animation

I am using Cocos Creator 3.

I have a ball spin animation and I wanted to detect specific time in that animation. Say after 20 sec. I want to do something else.

 this._ballAnimation?.play('spin);
 this._spinAnimationState = this._ballAnimation?.getState('spin');

I could track the
this._spinAnimationState.current
in update function and detect specific time.

But is there another way of doing this?

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