If you have a timer counting down then that should show up on the lock screen as I recall. Aside from that there might be a stopwatch/timer app with a widget that you can add and then be able to access by swiping right on the lock screen (so not quite on the lock screen but quite close essentially).
If you have a timer counting down then that should show up on the lock screen as I recall. Aside from that there might be a stopwatch/timer app with a widget that you can add and then be able to access by swiping right on the lock screen (so not quite on the lock screen but quite close essentially).