One of the quirks of the way the standing order has been written is that the interim estimates will be referred to standing committees, so standing committees will be able to review those interim estimates. It's not quite clear what kind of questions this committee or others might have, because basically you're asking questions about information that's for the expiring fiscal year, not for the coming fiscal year.
Not all spending is smooth throughout the fiscal year, and sometimes you have to spend more at the beginning of the fiscal year. You might see a larger amount for some departments and some organizations, so you could ask questions such as why they are spending more than three-twelfths in these interim estimates.