I can't speak to the current situation, but at the time when the person I mentioned worked for the Orioles, not all employees had it. This would have been mid 2010's. That and lower pay was the reason she left and went to work for a financial institution. She really liked her job with the organization and the people she worked with, but she cited the pay and benefits as the reason she needed to look for something else.
I do believe she was hourly, but I can't swear to that. I also know she got lots of perks such as discounts and "freebies" on a lot of things from promotional items to tickets.
I worked there 2001-2003.
The salaried people definitely had healthcare.