I'll make sure you're able to make a check report so you'll be able to keep track of your business expenses.
As mentioned by john-pero , currently, you can only run the Profit and Loss and Balance Sheet reports using the QuickBooks Online (QBO) app on your iPad Pro 2018. However, you can access your QBO account via a web browser to pull up the Check Detail report to view the checks you've written.
Go to the Reports menu.
Type Check in the search box, then select Check Detail.
Select the Customize button.
Set the Report period in the General section.
For additional details, select the Rows/Columns and the Filter sections to focus on specific accounts.
Click Run report.
You can memorize the Check Detail report to save the current customization settings you make. For the detailed steps, kindly check out this article: Memorize reports in QuickBooks Online. It also contains information about sending it by email on a recurring schedule.
To learn more about the features supported using your iPad, you can visit this article: Compare mobile app features. It contains a chart to easily view the feature available on your iPad.
Please let me know if you have other concerns. I'm just around to help.