How to ensure my wallet is connected to mainent?

I’ve installed Daedelus wallet using nixos with ./scripts/build-installer-nix.sh script.
When I start the wallet it says that the wallet is connected to the staging network.

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I’m want to stake my ADAs and transfer them from exchange to my wallet. How can I ensure that this wallet is on mainnet?

U should see Cardano network : mainnet but now is starting and it must sync

How can I connect to mainnet network?

If u downloaded from here : Daedalus - Downloads

It is for mainnet

The binary form released at Daedalus - Downloads doesn’t work on NixOs.
In NisOs we need to build it from a nix derivation.
I did that, but I wonder why it is not on mainnet!