Enlarge / The iPad Pro, Smart Keyboard, and Apple Pencil were all launched in Q1. (credit: Andrew Cunningham)

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It’s that time again: Apple will hold its quarterly earnings call at 5pm ET/2pm PT (10pm GMT) this afternoon, giving us an update on how its products are doing and just how many billions of dollars it managed to rake in over the holiday quarter.

This quarter, the biggest story to pay attention to is how the iPhone 6S is doing. Q1 of 2015 was the first full quarter of availability for the iPhone 6 and 6 Plus, and the first large-screened iPhones drove ridiculous 46 percent year-over-year unit sales growth. Strong sales and big growth in China drove record-high iPhone sales for the entire rest of the year, but now the pent-up demand for a larger phone has been met and China’s economy is slowing. The iPhone 6S and 6S Plus are both good follow-ups with plenty of upgrades, but nothing as compelling as those big screens were a year ago.

The iPhone is Apple’s most important product and it’s the one that growth-obsessed investors pay the most attention to when attempting to assess the company’s prospects, but there are plenty of other things going on, too. The “other products” segment will give us some vague idea of how the Apple Watch is doing, and we’ll also find out whether the iPad Pro has stopped or slowed the tablet’s sales decline (sales have been down every quarter since Q2 of 2014). We’ll be there to cover the call and provide charts and commentary, so hit the link below at 5pm ET to follow along.