Hold your horses.
So close.
Resources
https://managewp.com/wordpress-ssl-settings-and-how-to-resolve-mixed-content-warnings
https://css-tricks.com/moving-to-https-on-wordpress/
Testing the website
https://www.ssllabs.com/ssltest/
WordPress plugins
https://wordpress.org/plugins/really-simple-ssl/
https://wordpress.org/plugins/ssl-insecure-content-fixer/faq/