Вроде бы нет примерных дат. Нужно следить за обновлениями в Kusama, в этой сети это все будет тестироваться на финальной стадии
Core Functionality Polkadot is now moving to the next stage of opening up its core functionality, like parachain slot auctions, parathreads, and cross-chain message passing. These upgrades will require runtime upgrades that will pass through Polkadot's normal governance processes. The core functionality does not have to be unlocked sequentially — several features can be unlocked with a single proposal.
Parachains will first roll out on Kusama with a common good parachain, followed by the first slot auction and winner's onboarding. Once those parachains are working well on Kusama, the first common good parachain will launch, and then the first slot auction will take place on Polkadot.