Hi,
Status:
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Andrzej Kilijański is working on Delphi Port (WIP) by and3md · Pull Request #338 · castle-engine/castle-engine · GitHub constantly, to make 100% CGE units compileable by Delphi (right now he’s on X3DNodes). With the goal to finish things for TCastleWindowBase + Windows ASAP.
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I’m working on the PR too, to add secondary things: integrate with Delphi from CGE editor and build tool, test non-Windows platforms (we have access to Delphi Enterprise and can test all platforms, including Linux, Android, iOS).
We’ll give a presentation about it on upcoming DelphiCon in 2 weeks, you can register for free using Castle Game Engine - Coming to Delphi! - DelphiCon 2021 by Embarcadero .
To be honest there are no particular next steps where you can help right now. As multiple things are in progress by Andrzej or me for now 
You are most welcome to:
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Test. Get the branch from PR and test that things work, in particular that you can run from Delphi examples like
examples/user_interface/state_events/. -
Read news and comment about anything
I have listed some decisions and plans in the first news post, Delphi porting progress — basic CGE window with images and text works! – Castle Game Engine . More in Delphi Port Progress – window, UI, designs (JSON) serialization, XML compatibility, Delphi 11 / 10.4, Windows 32 and 64, PNG using PngImage – Castle Game Engine .