Pete,
Congrats! I consider this one the Grand Daddy of all figs.
Hope it does you well.
I agree with Martin,
Once the sucker get another couple inches or more get a coffee cup and poke a hole large enough to where you can stick the sucker right through and fill with potting mix. After a couple months then just clip it off and re-pot it into a larger pot.
Personally, I had trouble trying to root cuttings off this one. Just so you know.
Good luck