Application of the UK standard visit visa to the UK, notification of the sending of a visa by e-mail received, but not completed shipment after 9 days, a similar case?

My wife and I applied for a standard visit visa for the UK and received the email notification entitled "Your UK visa application was sent: XXX" on 11/28 last week.

We check the status of return labels on UPS everyday, but the label is still created after 9 days. We sent an email to UKVI and they told us that they were going to step up and asked several questions 3 days ago. But no change since then.

Wondering if anyone has a similar one before? How long does it usually take to ship after email notification?