set the page count in wp_options

wp-options-page-count-snippet.php

<?php
//UPDATE wp_options with page count
function wmps_page_count(){
    $page_count  = wp_count_posts('page')->publish;
    if ( get_option( 'wpms_data_pages_count' ) !== false ) {
        update_option('wpms_data_pages_count', $page_count);
    } else {
        add_option('wpms_data_pages_count', $page_count);
    }
}

add_action( 'transition_post_status', function ( $new_status, $old_status, $post )
{

    if( 'publish' == $new_status && 'publish' != $old_status && $post->post_type == 'page' ) {

        wmps_page_count();

    }
}, 10, 3 );