Hi @rollNsausage the important document for you to focus on is the Knowledge, skills, experience and grade file attached to that role.
Work through each of the categories in the document and plan out your responses in advance of an interview how you could apply relevant knowledge from your past roles to meet their needs for the role.
Bear in mind it's a very generic and high level job spec, so they've put everything you might do but have not specified exactly what you'll do.
To your question In the application form, there is a question about 'delivery management'. Sorry if I sound thick but what is that? I'm assuming its something that I know by a different term!
Delivery Management is just a fancy term they've used as a general category to describe project work you'd need to manage, as a general description -
For example they've mentioned
Possibly leading and definitely contributing to projects and/or specialist areas of work to deliver our objectives to time and to budget, efficiently and effectively. Being accountable for your contributions within a project.
The interview format could be
CV based - so make sure your CV is high quality, not too detailed, including broad statements about your past experience made relevant to this role
Competency based - they'll ask you to describe a time when you've done xyz to give you the chance to show how you've managed certain situations in the past.
I can't comment on how long the process takes, it varies from Govt department to department. 4-6 weeks maybe? Plus any security clearance.