The ARC open access policy states “Publication metadata (that is – journal name, title, author list, volume, issue, page numbers and such) must be submitted to the institutional repository as soon as possible after the paper is accepted for publication, no matter when (or if) the paper itself will become openly accessible” (ARC 2013).
All going well the new item (submitted to the Institutional Repository (IR) as a result) would be indexed in Google Scholar quite quickly “New papers are normally added several times a week” (Google 2013).
The ARC open access policy also states that “The manuscript/journal article should be submitted to the institutional repository as soon as possible after the publication date. The repository manager will ensure that the manuscript/journal article is made available at a date that complies with the journal’s copyright transfer agreement” (ARC 2013).
This appears to create a staged approach for submitting items to the IR.
Google Scholar advises us that ” … updates of papers that are already included usually take 6-9 months. Updates of papers on very large websites may take several years” (Google 2013).
It seems that this staged approach of submitting may result in less than optimal discoverability due to the delay in updates outlined above.
Certainly worth discussing before it is too late, keeping in mind that Google Scholar writes ” … we’re unable to make exceptions to any of the stated guidelines” (Google 2013).
ARC Australian Research Council “ARC Open Access Policy” Available from: < http://www.arc.gov.au/applicants/open_access.htm > 
Google Scholar “Inclusion Guidelines for Webmasters” Available from: < http://www.google.com/intl/en/scholar/inclusion.html#troubleshooting >