From the ASX site;The ex dividend (or ex date) occurs four...

From the ASX site;

The ex dividend (or ex date) occurs four business days before the company's Record Date and is the date the share registry closes to determine which shareholders are registered to receive the dividend. To be entitled to a dividend a shareholder must have purchased shares before the ex dividend date. If you purchase shares on or after that date, the previous owner of the shares (and not you) is entitled to the dividend.

If you buy tommorow, the previous owner, and not you is entitled to the dividend.