That's strange. Hopefully it updates soon, though it's possible you won't get a further update until it's at your local post office. Tracking tends to cease once it's on its last leg.
Don't you have the tracking info for this? UPS Mail Innovations lists an expected delivery date that us usually correct. Warner Archive usually ships through Innovations (usually free) and I've never had a package later than the listed estimated date of delivery which is usually up to 6 days...