How do I know if the seller actually released the USDT-USDC?

If @DigitalP2PBot tells you that the vendor released, it really is, but if you want to verify it you can do it as follows:

Write to the bot /listorders and if the bot is still in the process of paying your invoice the status you will see will be RELEASE, if the bot has already paid the invoice the order will not appear on the list.

When an order has status RELEASE, the seller no longer has any responsibility because he/she has released the USDT-USDC, if you have problems receiving go to the section The seller released but I don't get the USDT-USDC in my wallet.