6 months? That's too optimistic. This is a monthly manga so 6 months is a mere 6 chapters and considering how we're currently in an arc that doesn't have anything to do with big eye powers, otsutsuki tatoos and how Kawaki hasn't even been introduced yet and everyone is still kids (Boruto and Kawaki obviously knew each other before that scene) I'd say we won't see it for atleast a year or two.I suspect, probably not for a long time.
Give or take, 6 months.
We had stuff like this teased way back in Shippuden with Sasuke reveal and it took us 2 arcs to actually get there. Considering how the manga only started presenting new material, I'd say the Kawaki fans will have to wait quite a bit.