The standard OpenCPN
"currents" button on the toolbar shows the current
at the present time, as an arrow in outline.
OTcurrent allows you to choose any date/time. If you press the 'Now' button on OTcurrent (the clock icon) you should get arrows that match the ones from the 'current' button on the toolbar.
I am not going to add plugin messaging for OTcurrent due to the limited coverage of the harmonic tidal current predictions. However, there are gribs that already have forecasts of tidal current (see the Grib2 plugin threads on this forum).