1. In the sent folder of Gmail. (all sent items list)
Hovering over the 'My signature' icon, in particular sent email in the sent items list, it was seen that tracking takes a long time to update the status of the 'opened email'. It mostly shows 'sent without tracking' or 'not yet opened' (even when the tracking is on and the email has been opened by the receiver).
2. Clicking particular sent email individually:
An icon of 'My signature' that can be clicked does not appear, where the user can check the open/clicked time. (Reference: My signature Chrome extension sample screenshots)