The Cardano network is in the watershed phase of its network development and upgrades. The ongoing phase of the protocol’s roadmap is the Goguen phase, bringing smart contracts to the network. This is the third phase of the roadmap after Byron and Shelley. The Goguen phase was split into three stages, Allegra, Mary and Alonzo.
The Allegra update went live on December 16 last year, and the Mary update was deployed on the mainnet on March 1 earlier this year. This leaves the Alonzo upgrade, which was further split into three different phases, named Blue, White and Purple. While the final deployment of the Alonzo upgrade on the mainnet was planned to be in August 2021, there seems to be a delay in the phase’s release, as Alonzo is still in the testnet part of its progress.