Dash Core v19 activated successfully on 6th of July 2023.
Evo Nodes have been popping up a few days later.
Currently there are 27 Evo Nodes operating on the Dash Network (you can either use the Dash Core wallet or the Dash Masternode Tool to view them) 

In Dash Masternode Tool (DMT) it looks like this : https://i.imgur.com/29YaxPM.jpg

Each Evo Node get 4x masternode reward and can vote 4x
Each Evo Node needs to have a collateral of 4000 dash.
Currently Evo Nodes do not need to support Dash Platform (L2), they only need to support the Dash Network (L1)

Dash Testnet is currently on Platform v0.24, while devs work on both Platform v0.24 (with Javacript) and Platform v0.25 (Javascript stripped out of, to increase Platform performance)  
Devs are also working on Dash Core v20 in Dash Github (Develop branche)

Most likely Dash Platform will launch on Mainnet with Platform v0.25 (better Platform performance & more bug fixes) and with Dash Core v20
When Dash Core v20 activates on Mainnet, Evo Nodes will be required to update, so that they can support both L1 (Dash network) and L2 (Platform)
Instead of receiving 4x masternode rewards, they get only 1x masternode reward and rest of the masternode rewards will come from Platform.

You can follow the Dash Platform and Core Development Updates on Youtube (every 14 days, use google to locate them) to see the progress on Dash Platform and on Dash Core v20.