Basically this is the answer I was looking for from this question:

` function yoastVariableToTitle($post_id) {

$yoast_title = get_post_meta($post_id, '_yoast_wpseo_title', true);
$title = strstr($yoast_title, '%%', true);
if (empty($title)) {
    $title = get_the_title($post_id);
}
$wpseo_titles = get_option('wpseo_titles');

$sep_options = WPSEO_Option_Titles::get_instance()->get_separator_options();
if (isset($wpseo_titles['separator']) && isset($sep_options[$wpseo_titles['separator']])) {
    $sep = $sep_options[$wpseo_titles['separator']];
} else {
    $sep = '-'; //setting default separator if Admin didn't set it from backed
}

$site_title = get_bloginfo('name');

$meta_title = $title . ' ' . $sep . ' ' . $site_title;

return $meta_title;

} `

https://stackoverflow.com/questions/41361510/is-there-any-way-to-get-yoast-title-inside-page-using-their-variable-i-e-ti

Basically this is the answer I was looking for from this question:

function yoastVariableToTitle( $post_id ) {
    $yoast_title = get_post_meta( $post_id, '_yoast_wpseo_title', true );
    $title       = strstr( $yoast_title, '%%', true );
    if ( empty( $title ) ) {
        $title = get_the_title( $post_id );
    }
    $wpseo_titles = get_option( 'wpseo_titles' );

    $sep_options = WPSEO_Option_Titles::get_instance()->get_separator_options();
    if ( isset( $wpseo_titles['separator'] ) && isset( $sep_options[ $wpseo_titles['separator'] ] ) ) {
        $sep = $sep_options[ $wpseo_titles['separator'] ];
    } else {
        $sep = '-'; //setting default separator if Admin didn't set it from backed
    }

    $site_title = get_bloginfo( 'name' );

    $meta_title = $title . ' ' . $sep . ' ' . $site_title;

    return $meta_title;
} 

https://stackoverflow.com/questions/41361510/is-there-any-way-to-get-yoast-title-inside-page-using-their-variable-i-e-ti