I have MacBook Pro 13 2019 and looking for a way to connect it to this monitor (which I haven't ordered yet). Checking Apple Pro XDR requirements I noticed that it won't work with my laptop unless connected through Blackmagic eGPU (with updated firmware). I bought used eGPU for £200 and tested it on my 4k Samsung TV. When connected directly it has something like HD/30Hz maximum resolution, but through Blackmagic I managed to get 4K/60. I hope the same trick will work with Dell monitor. I still haven't decided yet, but it would be nice to find if MacBook Pro 13 2019/BM eGPU/Dell U3224 combinaion will lead me to 6K/60. Probably it is worth just buying and trying. I can always return it (or wait for M3 Pro laptops which I am planning to buy) if it doesn't work.