It's irrelevant what has happened on any specific day in the past. Seas are constantly changing. You could have calm seas or stormy seas. Bring the appropriate seasickness remedies if you anticipate issues.
Also, welcome to Cruise Critic.
Welcome to the forum.
Not to be obvious but why not just have the people who are in quarantine ask the people who are taking care of them? That would be your best source of information on the procedures.
Recommend you ask/research on the Cruise Travel Insurance forum. Here is the link for you:
https://boards.cruisecritic.com/forum/499-cruisetravel-insurance/