Problem Definition

 As of now, you are only able to view the "Date" value in the "Created/Updated" filter

In order to view the time as well, you will need to hover on the "Created/Updated" column in the filter in order to get the time value OR enable a different date/ time format at site-level (see Workaround, below).

Suggested Solution

Allow the configuration of allowing time to be viewed at a glance without the need to hover.

Why this is important

This helps the user to get a better view of the issue and grasp the period of when the issue has been created/updated.

Workaround

You can update the format displayed in these columns and include the timestamp by updating the Day/Month/Year Format under Settings > System > Look and feel (requires Jira Admin permissions)
<your site name>.atlassian.net/secure/admin/LookAndFeel!default.jspa

The following value in the "Day/Month/Year Format" field:

dd/MM/yyyy - hh:mm a

Results in the following format on the filter list/table:

Note, that this is a system-wide change and will affect all your users. It will also affect all Day/Month/Year formats in Jira (not just in the filter results page). Currently, it's not possible to define this on a filter/project/user basis