How to determine the size of collectionviewcell (xib)

Question

Is there a way to measure the width and height of a cell defined in xib from within "sizeforitemat" function or any other function of viewcontroller, once data is dynamically generated? The default layout of the collection view makes it very shabby as depicted in output. Principally layout should have maximally two columns, and the rest of the empty spaces should be divided between cells within a row. So I want to loop over all the items, once it is filled with data to determine the maximum size of amongst cells to generate a layout according to its size. I'll highly appreciate the response.

viewcontroller.swift

    import UIKit

    class ViewController: UIViewController, UICollectionViewDelegate, 
    UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
    
    @IBOutlet weak var collectionView: UICollectionView!
    let myCell: String = "CollectionViewCell"
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        self.collectionView.register(UINib(nibName:myCell, bundle: nil), forCellWithReuseIdentifier: myCell)
        
        self.collectionView.delegate = self
        self.collectionView.dataSource = self
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        150
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: myCell, for: indexPath) as! CollectionViewCell
        cell.lbl1.text = "\(indexPath.row)"
        cell.lbl2.text = "\(String(describing: cell.lbl2.text))\(indexPath.row)"
        print ("***", indexPath.item, cell.bounds.size, collectionView.frame.size)
        return cell
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        
        // TODO: measure width and heigth of each cell to find number of columns
        
        return collectionView.frame.size
    }
}

collectionviewcell.swift

    import UIKit

    class CollectionViewCell: UICollectionViewCell {

    @IBOutlet weak var lbl1: UILabel!
    @IBOutlet weak var lbl2: UILabel!
    
    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

}

viewcontroller's code

xib file's code

collection view cell

output