Source

File: wp-admin/includes/class-wp-ms-themes-list-table.php

public function column_autoupdates( $theme ) {
		global $status, $page;

		static $auto_updates, $available_updates;

		if ( ! $auto_updates ) {
			$auto_updates = (array) get_site_option( 'auto_update_themes', array() );
		}
		if ( ! $available_updates ) {
			$available_updates = get_site_transient( 'update_themes' );
		}

		$stylesheet = $theme->get_stylesheet();

		if ( isset( $theme->auto_update_forced ) ) {
			if ( $theme->auto_update_forced ) {
				// Forced on.
				$text = __( 'Auto-updates enabled' );
			} else {
				$text = __( 'Auto-updates disabled' );
			}
			$action     = 'unavailable';
			$time_class = ' hidden';
		} elseif ( empty( $theme->update_supported ) ) {
			$text       = '';
			$action     = 'unavailable';
			$time_class = ' hidden';
		} elseif ( in_array( $stylesheet, $auto_updates, true ) ) {
			$text       = __( 'Disable auto-updates' );
			$action     = 'disable';
			$time_class = '';
		} else {
			$text       = __( 'Enable auto-updates' );
			$action     = 'enable';
			$time_class = ' hidden';
		}

		$query_args = array(
			'action'       => "{$action}-auto-update",
			'theme'        => $stylesheet,
			'paged'        => $page,
			'theme_status' => $status,
		);

		$url = add_query_arg( $query_args, 'themes.php' );

		if ( 'unavailable' === $action ) {
			$html[] = '<span class="label">' . $text . '</span>';
		} else {
			$html[] = sprintf(
				'<a href="%s" class="toggle-auto-update aria-button-if-js" data-wp-action="%s">',
				wp_nonce_url( $url, 'updates' ),
				$action
			);

			$html[] = '<span class="dashicons dashicons-update spin hidden" aria-hidden="true"></span>';
			$html[] = '<span class="label">' . $text . '</span>';
			$html[] = '</a>';

		}

		if ( isset( $available_updates->response[ $stylesheet ] ) ) {
			$html[] = sprintf(
				'<div class="auto-update-time%s">%s</div>',
				$time_class,
				wp_get_auto_update_message()
			);
		}

		$html = implode( '', $html );

		/**
		 * Filters the HTML of the auto-updates setting for each theme in the Themes list table.
		 *
		 * @since 5.5.0
		 *
		 * @param string   $html       The HTML for theme's auto-update setting, including
		 *                             toggle auto-update action link and time to next update.
		 * @param string   $stylesheet Directory name of the theme.
		 * @param WP_Theme $theme      WP_Theme object.
		 */
		echo apply_filters( 'theme_auto_update_setting_html', $html, $stylesheet, $theme );

		echo '<div class="notice notice-error notice-alt inline hidden"><p></p></div>';
	}