The booster jab is displayed as dose 3/3 in the CovidSafe app. If you received Johnson&Johnson as a primary vaccine your booster jab will be listed as 2/1 (first booster jab) or 3/1 (second booster jab).
The new certificates are not automatically displayed in the CovidSafe app. You must press ‘Check for new certificates’ at the bottom and log in via Itsme or eHealth. The certificate is available in the app between 2 to 7 days following registration in the vaccination centre.