How to add a custom post status in wordpress for custom post type or post post type

For add a new custom post status add below code in your theme's function.php or your custom plugin's file

<?php

function rj_custom_post_status(){
     register_post_status( 'hide', array(    // hide => change with your custom status slug
          'label'                     => _x( 'Hide', 'post' ), // Hide -> change with ur status name
          'public'                    => true,

          'exclude_from_search'       =>false,

          'show_in_admin_all_list'    => false,
          'show_in_admin_status_list' => true,
          'label_count'               => _n_noop( 'Hide<span class="count">(%s)</span>', 'Hide<span class="count">(%s)</span>' )
     ) );
}
add_action( 'init', 'rj_custom_post_status',10 );
?>

For Display custom status on dropdown while add or edit post
<?php
add_action('admin_footer-post.php', 'rj_append_post_status_list',9999);
function rj_append_post_status_list(){
     global $post;
     $complete = '';
     $label = '';
   
          if($post->post_status == 'hide'){
               $complete = ' selected="selected"';
               $label = '<span id="post-status-display"> Hide</span>';
          }
          echo '
          <script>
          jQuery(document).ready(function($){
               $("select#post_status").append("<option value=\"hide\" '.$complete.'>Hide</option>");
               $(".misc-pub-section label").append("'.$label.'");
          });
          </script>
          ';
   
}
?>


For display custom status on quick edit post

function rj_append_post_status_bulk_edit() {
    global $post;
    if($post->post_status == 'hide'){
               $complete = ' selected="selected"';
          }
echo '
<script>
jQuery(document).ready(function($){
$(".inline-edit-status select ").append("<option value="\"hide\"" '.$complete.' >Hide</option>");
});
</script>
';
}
add_action( 'admin_footer-edit.php', 'rj_append_post_status_bulk_edit' );