sbb today, page-65

the audit is to be completed by end August, or a tad earlier.
so 2-3 weeks away. then you'll see the half yearly accounts validated.

As to when they declare a div date, i would be after the audited accounts.
(you cant give a div, without the numbers being checked off)

Typically there is a ex date, about 4 weeks before the pay date.

We dont know the specific pay date. if it is the end of sept, then you would have to have the ex date announced sometime after the audited accounts, and 4 weeks before the pay date.

So if they sneak the accounts in a week before the end aug, gives them a week or two after to get the ex date announced.

However, this would only be for a 6month Div, from Jan-June. so 0.425c probably.
Whether they wait until they have a full year of dividend, implies a later div date, or pay a partial one and keep to the timeline of sept in the prospectus. I dont know.