Display Content if Meta Checkbox is checked?

First make the custom post query with the WP_Query, and then we get the metadata by get_post_meta. Checkboxses are saved as boolean, that means either true or false. So make a check in the loop if checked or not (1=true, 0=false).

<?php get_header(); ?>

    <?php

    // The Query
    $the_query = new WP_Query( array(
       'post_type'      => 'books',
       'posts_per_page' => -1,
    ));

    // The Loop
    while ( $the_query->have_posts() ) : $the_query->the_post(); 

    $checke_meta = get_post_meta( $post->ID, 'rw_title_block', true );
    ?>

    <?php if( $checked_meta ) {
       echo 'Do stuff here if checked';
    } else {
       echo the_title();
    }
    ?>

   <?php 
   endwhile;
   // Reset Post Data
   wp_reset_postdata();

   ?>

<?php get_footer(); ?>