Remove Reading Time WP From Yoast og:desc

functions.php

/**
 * A Function to remove the auto generated Reading Time from Yoast og:desc
 *
 * This hooks into Yoast's `wpseo_opengraph_desc` filter and uses a regular
 * expression to remove the reading time for the post
 * 
 * @see Reading Time WP Plugin
 * @link https://wordpress.org/plugins/reading-time-wp/
 *
 * @param string $ogdesc The excerpt grabbed by Yoast for output.
 * @return string The $ogdesc with the Reading Time string removed.
 */
function remove_reading_time_from_yoast( $ogdesc ) {
	
	//First we get the options set on this version of Reading Time WP
	$rtwp_options = get_option('rt_reading_time_options');
	$rtwp_label = $rtwp_options['label'];
	$rtwp_postfix = $rtwp_options['postfix'];
	$rtwp_singular = $rtwp_options['postfix_singular'];

	// Next we build a regular expression using those options
	$rtwp_regex = $rtwp_label . '(.*?)(' . $rtwp_postfix . '|' . $rtwp_singular . ')';
	
	// Finally we use `preg_replace` to replace the reading time with an empty string
	$ogdesc = preg_replace('/' . $rtwp_regex . '/', '', $ogdesc);

	return $ogdesc;	
}

add_filter( 'wpseo_opengraph_desc', 'remove_reading_time_from_yoast' );