WordPress at a glance
function is not described

wp_schedule_update_checks() WP 3.1.0

Schedule core, theme, and plugin update checks.

No Hooks.

Return

Nothing (null).

Usage

wp_schedule_update_checks();

Code of wp schedule update checks: wp-includes/update.php VER 5.0.3

<?php
function wp_schedule_update_checks() {
	if ( ! wp_next_scheduled( 'wp_version_check' ) && ! wp_installing() )
		wp_schedule_event(time(), 'twicedaily', 'wp_version_check');

	if ( ! wp_next_scheduled( 'wp_update_plugins' ) && ! wp_installing() )
		wp_schedule_event(time(), 'twicedaily', 'wp_update_plugins');

	if ( ! wp_next_scheduled( 'wp_update_themes' ) && ! wp_installing() )
		wp_schedule_event(time(), 'twicedaily', 'wp_update_themes');
}