According to the graphics for macOS 26 Tahoe and for iPad OS 26 the Journal icon is featured. https://www.macrumors.com/2025/06/09/wwdc-2025-live-coverage/ see 11:25am and 11:06am
I never used this app because typing on an iPhone is not ideal, nor is the iPhone multitasking required to collect media from other apps. However, today's WWDC Keynote showed the Journal icon in the banner page for both iPad OS and for macOS.