shipping-notifications/ShippingNotifications/Block/ShippingCategory.php

<?php 

namespace Cpcommerce\ShippingNotifications\Block;

use Magento\Catalog\Block\Product\View\Description;
use Magento\Catalog\Model\Product\Attribute\Repository;
use Magento\Framework\View\Element\Template;
use Magento\Framework\View\Element\Template\Context;
use Cpcommerce\ShippingNotifications\Model\ShippingCategory AS DelayedShippingCategory;
use Cpcommerce\ShippingNotifications\Model\ResourceModel\ShippingCategory\Collection;
use Magento\Framework\App\ResourceConnection;
use \Magento\Framework\App\Config\ScopeConfigInterface;

class ShippingCategory extends Template
{
    protected $resource;

    public function __construct(
        Description $description,
        Repository $attribute,
        Context $context,
        array $data = [],
        DelayedShippingCategory $delayedShippingCategory,
        Collection $delayedCollection,
        ResourceConnection $resource,
        ScopeConfigInterface $scopeConfig
    ) {
        $this->description = $description;
        $this->attribute = $attribute;
        $this->delayedShippingCategory = $delayedShippingCategory;
        $this->delayedCollection = $delayedCollection;
        $this->resource = $resource;
        $this->scopeConfig = $scopeConfig;
        return parent::__construct($context, $data);
    }

    public function getShippingCategory(){
        $_product = $this->description->getProduct();
        $option_id = $_product->getShippingCategory();

        return $option_id;
    }

    public function getDelayedShippingCategories(){

        $delayedShipCategs = $this->scopeConfig->getValue('cpcommerce_shipping_notifications/general/shipping_categories',\Magento\Store\Model\ScopeInterface::SCOPE_STORE);

        if(isset($delayedShipCategs)){
            $delayedShipCategsArray = explode(",",$delayedShipCategs);
            return $delayedShipCategsArray;
        }
        
        return null;
    }

}