How to Get On Sale Products Collection

<?php
/**
 * Mageplaza
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Mageplaza.com license that is
 * available through the world-wide-web at this URL:
 * https://www.mageplaza.com/LICENSE.txt
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade this extension to newer
 * version in the future.
 *
 * @category    Mageplaza
 * @package     Mageplaza_Productslider
 * @copyright   Copyright (c) Mageplaza (https://www.mageplaza.com/)
 * @license     https://www.mageplaza.com/LICENSE.txt
 */
namespace Mageplaza\Productslider\Block;
use Zend_Db_Expr;
/**
 * Class OnSaleProduct
 * @package Mageplaza\Productslider\Block
 */
class OnSaleProduct extends AbstractSlider
{
    /**
     * @inheritdoc
     */
    public function getProductCollection()
    {
        $visibleProducts = $this->_catalogProductVisibility->getVisibleInCatalogIds();
        $collection = $this->_productCollectionFactory->create()->setVisibility($visibleProducts);
        $collection = $this->_addProductAttributesAndPrices($collection)
            ->addAttributeToFilter(
                'special_from_date',
                ['date' => true, 'to' => $this->getEndOfDayDate()],
                'left'
            )->addAttributeToFilter(
                'special_to_date',
                ['or' => [0 => ['date' => true,
                                                   'from' => $this->getStartOfDayDate()],
                                             1 => ['is' => new Zend_Db_Expr(
                                                 'null'
                                             )],]],
                'left'
            )->addAttributeToSort(
                'news_from_date',
                'desc'
            )->addStoreFilter($this->getStoreId())->setPageSize(
                $this->getProductsCount()
            );
        return $collection;
    }
}

<?php
$collection = $block->getProductCollection();
foreach ($collection as $_product) {
    echo $product->getName() . ' - ' . $product->getProductUrl() . '<br />';
}