I want to hide the post meta box for the plugin

Hello, You can add the below code to functions.php of your active/child theme to hide the box

/* WP Telegram | Hide post edit switch for non-admins */
add_filter(
	'wptelegram_p2tg_show_post_edit_switch',
	'wptelegram_filter_post_edit_switch'
);
function wptelegram_filter_post_edit_switch( $show_the_switch ) {
	// If current user is not an admin
	if ( ! current_user_can( 'manage_options' ) ) {
		return false;
	}
	// Otherwise retain the behavior for admins
	return $show_the_switch;
}
add_filter(
	'wptelegram\core\includes\options__get_post_edit_switch',
	'wptelegram_filter_post_edit_switch'
);