Does cancelling YTTV and Disney+ perks happen immediately or do you get the remaining duration???

OK, I have Fios 1GB and I get YTTV and the $10 Disney+ through Verizon. As both of the discounts that I had been enjoying have expired, I'd rather switch over to paying separately. The question that I have is that if I cancel today, do I lose those services immediately or if they stay active until the date that they're paid for? If they do go dark immediately, does Verizon prorate the charges?

If anyone has gone through this already, I'd be interested in hearing how it went. Thanks.