Depends how they intend to use those boots on the ground. Theoretically they can go in immediately since they've got their troops mobilised on the border, merely a few miles away from Kobane. Heck if they wanted to they could blow ISIS out of the water in Kobane today and be home in time for tea this evening. But I stand by my opinion that they have no interest in doing so.
If in some strange parallel universes Turkish troops go in and lay waste to ISIS, there's no chance they're conceding the city to the Kurds. So either way, the Kurds are getting fecked. Turkey are an obstacle not a potential solution, the solution is to shower the Kurds with some serious heavy weaponry, continue a surgical bombardment and hope they turn the tide of the battle. Then for lols fire a stray missile at a Turkish troop regiment on the border.