In the Transfers/Activity section, you can find the history of your transactions.
Transfer statuses will be ticked, show a clock or a cross:
A Checkmark - Your transfer has been successfully sent and accepted by the recipient bank;
A Cross - Unsuccessful transfer;
A Clock - The status of the transaction is not defined yet.
Determining the status is usually instant, but in some cases, it can take up to 3 business days.