My opinion is it’s worth starting learning barre chords early. I don’t mean put a ton of time into them but try a few times and then move on with the rest of your practice routine and do that each day.
My thinking behind this is that if you wait until you really need them for a song it could really slow you down and become frustrating. It took me quite some time to get a fairly consistent F chord going, with the side of my finger getting sore until I worked out what worked for me. When I got to a song that needed it, I could mostly already play it with just a bit more repetition needed for speed.
Same here. The type of music I like to play tends to be very power chord and barre chord based. As a result, I was attempting to learn them earlier than they came up In the course. I did still follow the beginners course fully through grades 1&2 even as I was looking through the lessons that came further down the line for the chords I wanted to be able to play. I was trying to play a power chord the second day I had my guitar 
I don’t see the harm in exploring other chords as long as you are still following along with the beginners course and doing the practice routines. I think I actually prefer barre chords over open chords now.
But to answer your original question @Joksy there is no lesson specifically on the B chord like there are for say, A,D and E in the beginners course. Rather, you will learn how to form both B major and B minor in the two barre chord lessons that @Richard_close2u pointed out in his answer above.
Hah, you and me both. As soon as I could somewhat do the F it was all over the fretboard.
Same with power chords, I was trying those straight away, but my technique was really bad until after the lesson - I was doing them Kurt Cobain style before that.
I am really for exploring and experimenting.
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