I have some fund and I want to know how can I ge them on my main net wallet
You can withdraw it at https://wallet.zksync.io/, but I don’t think I would recommend doing that. The withdrawal requires transaction costs and if you want to move the tokens, you can withdraw directly to where you want to move them to. This would save you additional transaction costs from first withdrawing and then moving the tokens.
Additionally, the tokens are already fully under your control and your ownership is cryptographically guaranteed on the mainnet blockchain. Even if zkSync goes down completely, you can still claim the tokens. So you’re not relying on any side chain or anything.