This reward has been handed out for quite a while. It started around early November last year. However, like many of the other plat rewards (HZD, Bloodborne most notably), few people have been getting the e-mail (you have to check a box in the settings to receive promo e-mail from Sony, to begin with).
Koding said:Nice avatar. Sadly, I won't be getting it as I haven't finished the game yet. Honestly, I've barely started it but I want to get back to it ASAP.
You can get it whenever you get the plat, doesn't have to be now. Though you may have to go through PS support if you don't receive the e-mail automatically.