I'm using CMB2 plugin to add metaboxes into a custom post type. I'm adding the additional metaboxes via functions.php onto child theme. It may worth to mention that parent theme/custom post already has a few metaboxes defined, I'm just complementing... 

I already successfully created metaboxes with field type = Text and echo values into target page, however when filed type = Select I can create the meta field but can't echo the selected option into target page. 

Could you please help me out? I appreciate it. 

***Functions.php (creating the metaboxes)***

    add_action( 'cmb2_meta_boxes', 'custom_metabox' );

    function custom_metabox( array $metaboxes ) {
        $metaboxes[REALIA_PROPERTY_PREFIX . 'ficha_tecnica'] = array(
            'id'                        => REALIA_PROPERTY_PREFIX . 'ficha',
            'title'                     => 'Ficha Técnica',
            'object_types'              => array( 'property' ),
            'context'                   => 'normal',
            'priority'                  => 'high',
            'show_names'                => true,
            'fields'                    => array(
             
                array(
                    'id'    => REALIA_PROPERTY_PREFIX . 'area_terreno',
                    'name'  => 'Área do Terreno',
                    'type'  => 'text'
                ),
            
                array(
                    'id'               => 'wiki_test_select',
                    'name'             => 'Test select inline',
                    'type'             => 'select',
                    'show_option_none' => true,
                    'default'          => 'custom',
                    'options'          => array(
                        'standard' => __( 'test123', 'ficha' ),
                        'custom'   => __( 'test1234', 'ficha' ),
                         'none'     => __( 'test12345', 'ficha' ),
                ),
            ),
        ),
    );

    return $metaboxes;
    
}


***And then I output onto the page's content area***

        <div class="col-sm-12 <?php if ( ! empty( $images ) ) : ?>col-md-5<?php else : ?>col-md-12<?php endif; ?>">
        <div class="property-list">
			<h2><?php echo __( 'Property overview', 'realia' ); ?></h2>

            <dl>
            	<?php $price = Realia_Price::get_property_price(); ?>
            	<?php if ( ! empty( $price ) ) : ?>
                	<dt><?php echo __( 'Price', 'realia' )?></dt><dd><?php echo wp_kses( $price, wp_kses_allowed_html( 'post' ) ); ?></dd>
            	<?php endif; ?>

                <?php $area = get_post_meta( get_the_ID(), REALIA_PROPERTY_PREFIX . 'attributes_area', true ); ?>
                <?php if ( ! empty( $area ) ) : ?>
                	<dt><?php echo __( 'Área do Terreno', 'realia' ); ?></dt><dd><?php echo esc_attr( $area ); ?> <?php echo get_theme_mod( 'realia_measurement_area_unit', 'sqft' ); ?></dd>
                <?php endif; ?>
                
                <?php $metafield_id = get_the_ID(); ?>
                <?php $test = get_post_meta( $metafield_id, REALIA_PROPERTY_PREFIX . 'options', true ); ?>
 				<?php if ( ! empty( $test ) ) : ?>
                	<dt><?php echo __( 'test123', 'realia' ); ?></dt><dd><?php echo $test; ?></dd>
                <?php endif; ?>

            </dl>
        </div><!-- /.property-list -->
    </div>
</div><!-- /.row -->

<!-- DESCRIPTION -->

<?php if ( get_the_content() ) : ?>
    <h2 class="page-header"><?php echo __( 'Apresentação', 'realia' ); ?></h2>

    <div class="property-detail-description">
    	<?php the_content(); ?>
    </div><!-- /.property-detail-description -->
<?php endif; ?>