Homey does not only controls your home, but also monitors it. To view the data Homey has been gathering about your home and devices, you can make use of Homey Insights.
Open Homey Insights
To access Homey Insights, open https://insights.athom.com on your smartphone or PC. Once logged in you will see an overview of your insights.
Select Data Sources
Select sources on the left to view the accompanying data in the graph area.
In the top right corner of the screen you can select the timeframe you want to see in your Insights overview.