Website response time :Difference between "load" and "finish" ,
It seems this 'Finished' time in Chrome devtools includes the asynchronously loading(non blocking) objects/elements on the page which may continue downloading way after the onload event for page has fired.
The response time for a website generally speaking means 'Load' time because that is more easily user perceivable, at this point user can see browser has finished working and page is ready on their screen. Finish time, although technically also a response time doesn't have as much end-user implication.
In some cases it seems the Finish timer never stops and continues increasing so it may not be the best assessment of web page response time.
DevTools displays the timing of the DOMContentLoaded and load events in multiple places on the Network panel. The DOMContentLoaded event is colored blue, and the load event is red.