Ash here from the Shopify team. Welcome to the Shopify Community!
I understand you've connected your own custom domain to your shop, and the SSL is currently listed as "pending". This is expected behaviour within the first 24-48 hours after connecting a custom domain to your shop. As long as the domains DNS settings are applied correctly (A-Record: 18.104.22.168, CNAME Record: shops.myshopify.com), then the SSL will be automatically applied once the domain is finished being set up. When did you connect the domain to Shopify? If you've waited longer than 48 hours and the SSL is still not active, then please reply back here and let me know so we can take a closer look together.