Admin Colums Pro API method for fetching columns by post type

acp_get_columns_by_post_type.php

<?php

/**
 * @param string $post_type
 * @param string|null $layout
 *
 * @return \AC\Column[]
 */
function acp_get_columns_by_post_type( string $post_type, string $layout = null ): array {
	$list_screen = new \ACP\ListScreen\Post( $post_type );

	if ( $layout ) {
		$list_screen->set_layout_id( $layout );
	}

	return $list_screen->get_columns();
}

/**
 * Example Usage
 */
add_action( 'admin_init', function() {
	$columns = acp_get_columns_by_post_type( 'post' );
} );