Vigo Islas Cies

Does anyone know if it is possible to visit the Islas Cies on a stop in early May from 11 am to 6 pm?

I know there is a ferry service, but early May could be too early for it to operate. Maybe somebody will come along with the answer.

Otherwise Google or ask on Tripadvisor.

According to a couple of websites there are daily sailings from 1st May but, as only 2200 visitors are allowed daily, some dates seem to be already fully booked.

https://www.mardeons.es/en/travel/cies-islands/timetables-and-prices/

https://www.aladinia.com/barco-a-las-islas-cies?utm_source=bing&utm_medium=cpc&utm_campaign=Organizadores%20Islas%20Cies&utm_term=islas%20cies%20ferry&utm_content=14653%20-%20Ferry%20Islas%20Cies

Just noticed that May comes in the low season schedule when sailing times don't seem to fit in with your time scale ashore.