You can install Timepiece - Time in Status for Jira to your Jira Cloud instance in two ways: Install the app from Atlassian Marketplace or Install the app from Jira admin pages.
Install the app from Jira admin pages:
Open Jira Settings >> Apps
Enter Timepiece in the textbox. Press Enter.
Timepiece - Time in Status for Jira by OBSS will appear in the search results. Click on it.
Click on Try it free.
"Add to Jira" window will pop-up. Click on Start Free Trial.
6. Jira will install the app and the trial license.