How to determine the source and destination of each step of the transfer flow?

Hello,

I send funds from the verified customer’s bank to the other verified customer’s bank.

I can’t know when the transfer is fully completed. I need to know the case of the source balance to the destination balance and the destination balance to the destination bank.

For example, customer_transfer_completed event occurs when the funds are transferred from source bank to source balance or source balance to destination balance, right?

So how to know the source and destination on each step of the transfer flow? - source bank to source balance and source balance to customer balance in the above case.

Thanks in advance,
Alvaro