How export income reconcile in QB when income deposited in USD bank account but books maintaining in AUD

As export business client maintain 2 business bank account 1 USD and 1 AUD. After receiving export income in USD account client do not transfer that amount straight to AUD bank account, most of the time they wait for favorable exchange rate. Because of we maintaining books on AUD currency, it is difficult to recognise income on time as should be. Any suggestion and tips will be much appreciated.