I do know they're working on adding Tapas coins to the desktop site, but I don't know when.
It's probably pretty high priority, but it won't be easy to implement it considering the programming needed to add the coin store and unlocking system, plus making desktop coins compatible with tipping.
I'm not a staff member, so I have no idea where they are, but I'd estimate it'd take at least 3-6 months to maybe even a year for such a big project until they implement it.