During drag-n-reorder operation, how to detect when the cell is visually being switched position?

I use the following code snippet to implement drag and reorder operation.

class DashboardViewController {
    private func initCollectionView() {
        ...
        
        let gesture = UILongPressGestureRecognizer(target: self, action: #selector(longPressGesture))
        collectionView.addGestureRecognizer(gesture)
    }
    
    @objc func longPressGesture(_ gesture: UILongPressGestureRecognizer) {
        switch gesture.state {
        case .began:
            self.began(gesture)
        case .changed:
            self.changed(gesture)
        case .ended:
            self.ended(gesture)
        default:
            self.cancel(gesture)
        }
    }
}

extension DashboardViewController {
    func began(_ gesture: UILongPressGestureRecognizer) {
        print(">> began")
        
        let location = gesture.location(in: self.collectionView)
        
        guard let indexPath = self.collectionView.indexPathForItem(at: location) else {
            return
        }
        
        collectionView.beginInteractiveMovementForItem(at: indexPath)
    }
    
    func changed(_ gesture: UILongPressGestureRecognizer) {
        print(">> changed")
        
        collectionView.updateInteractiveMovementTargetPosition(location)
    }
    
    func ended(_ gesture: UILongPressGestureRecognizer) {
        print(">> ended")
        
        collectionView.endInteractiveMovement()
    }
    
    func cancel(_ gesture: UILongPressGestureRecognizer) {
        print(">> cancel")

        collectionView.endInteractiveMovement()
    }
}

As you can see in the screenshot, when I start to drag and 1st cell, changed will keep being called.

When I drag close enough to the 2nd cell, the 2nd cell will then visually switch position to 1st.

I would like to be able to detect, when the 2nd cell is visually switch position to the 1st. Does anyone know how I can achieve so?

Thanks.