Today I received an Apple DTK. I tried out the following Lazarus applications compiled for Intel x86-64:
MRIcroGL OpenGL Volume Rendering, PascalScript, PythonEngine
https://github.com/neurolabusc/MRIcroGL Surfice OpenGL Suface Rendering, PythonEngine
https://github.com/neurolabusc/surf-ice/releases Several Metal Projects
https://github.com/neurolabusc/Metal-Demos Lazarus IDE
In general, they all seem fine. Despite being deprecated, OpenGL works very nicely. MacOS 11.0 Beta still comes with Python 2.7 installed (despite 2.7 being past "end of life").
The performance of the OpenGL graphics is really just fine. Since my desktop is a 1920x1080 while my MacBook is a retina 2560x1600, this may not be a fair comparison. However, the performance of the Lazarus built x86-64 tools seems pretty seamless and completely usable.
The big issue I have encountered is that I can not install the Xcode command line tools. Running "xcode-select --install" from the command line brings up the standard "Finding software" window, but after a few hours it has not finished. I will try updating all system software and restarting. Without the SDKs installed by this tool, I can not compile Lazarus or FPC projects on the DTK.
So long story short, looks like Intel-compiled Lazarus projects work just fine on Apple Silicon. Hopefully Jonas and Dmitry can get fps and Lazarus compiling locally in short order.