Currently Egretia (EGT) is represented as a Token of Ethereum Network, but is there any changes regarding shifting from Token to Coin on its own Chain?
As noted by Richard:
Roadmap says "2020 Q2 - Egretia Public Chain 1.0 Release". (egretia.io)
This means that its own blockchain will be launched then and its own coin released. This does not, however, say anything about when the token will be migrated into the new blockchain. But it's quite probable that the migration happens immediately when the new blockchain is up and running.
In general terms creating a token is so easy and cheap quite that many projects start with issuing tokens and then later shift to using their own blockchains (if that was their intention). The shift itself is not trivial but doable:
1) Ask user his address in the new blockchain and verify his address (with whatever means) in Ethereum to see how many tokens he has
2) Assign new coins in the blockchain to his address. This should probably be done all in one initial distribution as it's typically not easy to just "mint" new coins in a blockchain.
3) Burn the user's tokens in Ethereum