Moving mail messages from one account to another, and not leave a copy.

I use 2 gmail accounts and receive a lot of messages that I want to move or transfer from one to another. The second is like an archive. But I don't want to keep them in the original account.

I do this in "mail" in my iMac. I have both accounts connected, and create a Smart Mailbox that selects the messages that I want to move. I select them and drag and drop to the corresponding account, or use the menu command "Move to..." where you can select the destination account.

The problem is that it leave a copy of the messages in the original account. One obvios solution is to do this, and immediately delete the originals. I don't like to do this because when you move (should I say copy) a lot of messages, the process take a while, so I'm not sure if the messages are already in the new account.

I'm using macOS 11.4 and Mail Versión 14.0