When will the fitness widget be released for iPad on iPadOS 18.4?

Apple has not announced any plans to introduce a Fitness widget for iPad in future updates.

For tracking your fitness data, you can continue to use the Fitness app on your iPad, which allows you to view activity rings, workouts, and trends synced from your Apple Watch or iPhone.

Apple invite submission of comments and feature requests via its Product Feedback portal. If you would like to see a specific feature or functionality in a future version of iPadOS, this would be the most appropriate channel through which to make a request:

Feedback - iPad - Apple

You’re very welcome.