Recognise order meta for you to b e able to use it in your args to display specific orders - Woocommerce

recognise-meta-key-order-query.php

<?php
// add this filter to recognise meta key when you do your order query
add_filter( 'woocommerce_order_data_store_cpt_get_orders_query', 'my_function', 10, 2 );
function my_function( $query, $query_vars ) {
    if ( ! empty( $query_vars['_my_custom_order_meta'] ) ) {
        $query['meta_query'][] = array(
            'key' => '_my_custom_order_meta',
            'value' => esc_attr( $query_vars['_my_custom_order_meta'] ),
        );
    }
    return $query;
}

// Then when you want to get orders under that meta key
$args = array(
  '_my_custom_order_meta'		=> 'your_meta_value',
);
$new_order_query	= new WC_Order_Query( $args );
$orders				= $new_order_query->get_orders();