Went last week and the busiest day was registering my child. After that checking my child in and out was a breeze with barely any wait. It was not crowded at all in the kids club and I was on Harmony.
We all did a PCR test a few days before our cruise and all of us except one person tested negative for covid, but when they did antigen that same day they were negative.
Just got my email today and boarding in two weeks. Maybe this will help. The only problem I read is that if you are not registered there will be a delay. Other than that you will get on the ship at long as the child is negative.