It would require all third parties who have an obligation to report after a general election to report on all of their partisan activities since the last general election. A third party who did not incur expenses during a pre-writ and a writ period would not have to report anything on what happened between the two elections, but those who are required to report would, yes, be required to report on that as well.
On October 17th, 2018. See this statement in context.