You should be fine. The last 3 eruptions have had localized impacts. Because of its location they seem to be expecting a similar situation. We were there this summer during the most recent eruption. That was slightly east and north of the current situation. We saw some smoke from the eruption as we drove to the airport but it had zero effects on flights.
One of our guides said the type of eruptions they have had recently don’t tend to cause travel disruptions because they don’t cause ash plumes.
The 2010 eruption caused air travel disruptions because it erupted underneath a glacier that cause a lot of ash to be ejected. That one was called Eyjafjallajökull.
I hope this helps reassure you a bit. For others, the cruise port is well away from the affected area.