DHL does not have any official explanation on what “scheduled for delivery as agreed” means. But it’s most likely not a big deal and only saying that you can expect a package to arrive on time based on the agreed conditions. But to be safe, it’s still best to contact DHL to ask why you’ve received such a message.
This message is telling you that your package is currently in processing at a customs facility, but it has not finished the process and is not yet cleared for shipment. There are many reasons why you might see this, but all of them are tied to unexpected delays. The challenge is that DHL is not in control.