The Nike+ Run Club app now support Siri Suggestions, allowing Siri to suggest ideal times for a run based on run history. Siri Suggestions can be enabled by going to Settings > Siri & Search > Nike Run Club.
On the Apple Watch, the Nike+ Run Club app now offers complications that are designed to be used with the Infograph watch faces on the Apple Watch Series 4 models.
Nike recommends using the Apple Watch app on the iPhone to add and customize the new Nike Run Club complications.
Nike+ Run Club can be downloaded from the App Store for free. [Direct Link]