Where can I set contentOffset to the last item in UICollectionView before the view appears?

I am scrolling multiple horizontal collectionViews to the last (Far right) item using:

 timelineCollectionView.scrollToMaxContentOffset(animated: false)
   postsCollectionView.scrollToMaxContentOffset(animated: false)

this works great, except I can't figure out where to put them.

Various places I've tried:

viewWillAppear - it doesn't scroll as though the cells aren't fully loaded yet.

viewDidAppear - it does scroll perfectly. Awesome! Except now you can see it scroll even when you put animated: false. The collectionView loads at the far left for a split second before updating to the far right

viewDidLayoutSubviews - this works perfectly - timing and everything! However, it gets called many times. If I could determine which subview was just laid out, perhaps I could scroll it in there but Im not sure how.

Is there a better option? How can I do this?

Also these are the functions I am using to set content offset:

extension UIScrollView {

    var minContentOffset: CGPoint {
        return CGPoint(
            x: -contentInset.left,
            y: -contentInset.top)
    }

    var maxContentOffset: CGPoint {
        return CGPoint(
            x: contentSize.width - bounds.width + contentInset.right,
            y: contentSize.height - bounds.height + contentInset.bottom)
    }

    func scrollToMinContentOffset(animated: Bool) {
        setContentOffset(minContentOffset, animated: animated)
    }

    func scrollToMaxContentOffset(animated: Bool) {
        setContentOffset(maxContentOffset, animated: animated)
    }
}

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