You can easily tell based on the topic being discussed. The Mass readings always follow a schedule throughout the year. If he's discussing the Baptism in the Jordan than it's for today. Question is whether it was prerecorded since Masses probably aren't public with Italy's lockdowns.

Of course you could theoretically just show the sermons from the same day in previous years, but you'd think someone would be able to figure that out.

I also don't know what's actually being shown since I didn't see the feed. Is it a full Mass or just a recording of a sermon he did at some point?

You can easily tell based on the topic being discussed. The Mass readings always follow a schedule throughout the year. If he's discussing the Baptism in the Jordan than it's for today. Question is whether it was prerecorded since Masses probably aren't public with Italy's lockdowns.

Of course you could theoretically just show the sermons from the same day in previous years, but you'd think someone would be able to figure that out.