Will I be able to delegate to a stake pool from my mobile phone with Daedalus?
You cannot use Daedalus on mobile because there is no mobile version. Daedalus is a "full node", i.e., it runs a cardano-node in the background, which maintains a complete copy of the blockchain. This is not intended to happen on mobile due to their limited resources. Mobile wallets like Yoroi work by connecting to a full node in the cloud.
WARNING: There have been apps claiming to be mobile versions of Daedalus pop up on some of the app stores. These are SCAMS! I've talked with people in the community that have had their ADA stolen because they trusted what appeared to be a legitimate Daedalus mobile app.
No, Daedalus has no mobile version right now and there is no mobile version planned in the future. Daedalus is a full node wallet, this means the whole blockchain is downloaded to the device where the wallet is running. On mobile devices this would be impractical as there is usually not that much storage on those devices.