Usually you can ask your bank to provide GPI payment tracking. If your bank is connected to GPI, they will be able to show the whole chain of banks from sender to destination. SWIFT payment can have different status codes:
ACCC - final status of successful payment - credited to the beneficiary's account.
ACSP - accepted, settlement in progress. Often it is an indicator that the payment is under manual review. Read more about ACSP. Sometimes you can see a reason for ACSP as well:
RJCT - payment was rejected. Read more about rejected SWIFT payment.