The simplest way to check when a specific team expires is through the Admin Dashboard.
Here's how you can do that:
Navigate to the Teams tab within Teams Manager.
Switch to the toggle in the top right corner to Admin view.
Select the Active tab.
Locate the desired team from the Active Spaces list (you can use the search bar if you have a lot of them).
You'll notice an "Expires On" column with a specific expiration date for the team, along with a convenient Lifecycle progress bar showing the team's progress along its lifespan.
You can also wait to receive a Chat notification for the team, but this will depend on how your Lifecycle policy is set up, so the Dashboard is the most convenient option.