As each batch is completed they should be updated.  Make sure you have printed the Cash Receipts Register first.  If you have not then a warning will display and you will not be able to proceed with the update.

The cash receipts update will post the appropriate figures to the General Ledger.  Note that the Accounts Receivable information such as Customer AR Balance and Accounts Receivabel items file have been updated as soon as the receipts were applied.