When your Automate is triggered, your funds are set to be invested on the next trading day between 10:30 am - 11:00 am by default.

If you want to set a different time, you can do so by activating the following experimental feature and heading to Settings > Share settings & dividends > Customisation to change the Autoinvest execution time.

For more information on how Automate works please check out this help article.