While broadcasting template messages through Multichannel, the status of the broadcast messages will be divided into 3; delivered, failed and on progress.
There are several reasons why the template messages statuses stuck on progress:
1. The phone you are trying to send the message to is inactive
2. The customer block the WABA number
3. The number is inactive although valid account
The status will change when the number you were trying to send the message is activated or unblock your WABA, but it doesn't have an exact timeline. As of now there is no way to check if an account blocked your WABA or just inactive.
Please do note that while the status message is on progress, it will not reduce your broadcast template quota.
At this time, the status will be expired within 30 days and will not be retried, but WhatsApp may change this policy at any time.