Ann: Share Purchase Plan Offer Booklet, page-18

To apply for New Shares under the SPP, Eligible Shareholders must make a BPAY® or Electronic Funds Transfer (EFT) payment by using the reference number shown on their personalised Share Purchase Plan Application Form, which is required to identify your holding. Payment must be received in cleared funds by 5pm (AWST time) on the Closing Date. If an Eligible Shareholder chooses to pay for New Shares by BPAY® or EFT, they do not need to submit their personalised Share Purchase Plan Application Form.

I think I would be making the payment today and as early as possible maybe contact your financial institution to find out when the funds would be cleared to the receiver..