get all custom post type titles and show it as selectbox in a meta box

Question

i have a custome post type known as "Motor_supply"

i want to show "Motor_supply" titles by a category as a "selectbox" in metabox on shop_order

i want to know how can i create a loop and put published "Motor_supply" posts titles in it

i have this code

class select_motor {
    private $config = '{"title":"\u062a\u062e\u0635\u06cc\u0635 \u0645\u0648\u062a\u0648\u0631","prefix":"select_motor","domain":"select_motor","class_name":"select_motor","post-type":["post"],"context":"normal","priority":"default","cpt":"shop_order","fields":[{"type":"select","label":"select motor","options":"option-one : MOTOR_1\r\noption-one : MOTOR_2","id":"select_motorselect-motor"}]}';

    public function __construct() {
        $this->config = json_decode( $this->config, true );
        $this->process_cpts();
        add_action( 'add_meta_boxes', [ $this, 'add_meta_boxes' ] );
        add_action( 'save_post', [ $this, 'save_post' ] );
    }

    public function process_cpts() {
        if ( !empty( $this->config['cpt'] ) ) {
            if ( empty( $this->config['post-type'] ) ) {
                $this->config['post-type'] = [];
            }
            $parts = explode( ',', $this->config['cpt'] );
            $parts = array_map( 'trim', $parts );
            $this->config['post-type'] = array_merge( $this->config['post-type'], $parts );
        }
    }

    private function select( $field ) {
        printf(
            '<select id="%s" name="%s">%s</select>',
            $field['id'], $field['id'],
            $this->select_options( $field )
        );
    }

    private function select_options( $field ) {
        $output = [];
        $options = explode( "\r\n", $field['options'] );
        $i = 0;
        foreach ( $options as $option ) {
            $pair = explode( ':', $option );
            $pair = array_map( 'trim', $pair );
            $output[] = sprintf(
                '<option %s value="%s"> %s</option>',
                $this->select_selected( $field, $pair[0] ),
                $pair[0], $pair[1]
            );
            $i++;
        }
        return implode( '<br>', $output );
    }

    private function value( $field ) {
        global $post;
        if ( metadata_exists( 'post', $post->ID, $field['id'] ) ) {
            $value = get_post_meta( $post->ID, $field['id'], true );
        } else if ( isset( $field['default'] ) ) {
            $value = $field['default'];
        } else {
            return '';
        }
        return str_replace( '\u0027', "'", $value );
    }

}
new select_motor;