如何通过一些额外的元键值获取帖子orderby title

I was searching for this but didn't find the solution. I am getting posts orderby title but some posts need to come first so I added a custom field which meta_key is display_postion and the values for this fields are numbers i.e. 1,2,3. So how do I achieve this, below is my current code.

$args = array(
   'post_type'         => 'products',
    'order'    => 'ASC',
    'orderby'=> 'title',
    'post_status' => 'publish',
    'posts_per_page' => -1,
     'paged'             => $paged
   ;
   $wp_query =  new WP_Query( $args );
   if ( $wp_query->have_posts() ) : while ( $wp_query->have_posts()) : $wp_query->the_post();

Adding meta_value_num to an orderby array and referencing 'display_position' in the meta_key field should do the trick:

$args = array(
    'post_type' => 'products',
    'order' => 'ASC',
    'orderby' => array(
        'meta_value_num' => 'ASC',
        'title' => 'ASC'
    ),
    'post_status' => 'publish',
    'posts_per_page' => - 1,
    'paged' => $paged,
    'meta_key' => 'display_position'
);
$wp_query = new WP_Query($args);

if ($wp_query->have_posts()):
    while ($wp_query->have_posts()):
        $wp_query->the_post();

See documentation for Order and Orderby parameters for WP_Query.