How to return/export only data showing on screen in custom post type view all screen

<?php
//edit.php?s&post_status=all&post_type=shirts&action=-1&m=0&slug=03-02-2020&filter_action=Filter&paged=1&action2=-1 
//$parse_uri = explode('wp-content', $_SERVER['SCRIPT_FILENAME']);
//require_once($parse_uri[0] . 'wp-load.php');
header("Content-Description: File Transfer");
header("Content-Type: application/csv");
header('Content-Disposition: attachment; filename="wp.csv"');
header('Pragma: no-cache');
header('Expires: 0');

global $post;

//https://developer.wordpress.org/reference/classes/wp_query/
$post_status = isset($_REQUEST['post_status']) && $_REQUEST['post_status']=='all' ? 'any' : 'publish';
$date = explode('-',$_REQUEST['slug']);
$posts_per_page = $_REQUEST['action2'];
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;

$arg = array(
    'post_type' => $_REQUEST['post_type'],
    'post_status' => $post_status,
    'posts_per_page' => $posts_per_page,
    'paged' => $paged,
    'date_query' => array(
        'column' => 'post_date',
        'year' => $date[2],
        'month' => $date[1],
        'day' => $date[0],
    )
);

$posts = new WP_Query($arg);

if($posts->have_posts()){

    $file = fopen('php://output', 'w');

    fputcsv($file, array('COLUMN ONE', 'COLUMN TWO'));


    while ( $posts->have_posts() ){
        $posts->the_post();

        $color = get_post_meta( $post->ID, 'user-color', true );
        $size = get_post_meta( $post->ID, 'user-size', true );

        fputcsv($file, array($color, $size));
    }

    fclose($file);

}
?>