ACA620 units have already reached AmigaKit, they should already be shipping.
ACA1220 and ACA1232 will take another week or so. I have just picked up the first sample from the assembly place and will spend the rest of the day giving them a full test before the mass-production can continue.
BigRamPlus may also take a few more days. No good news there, it's a very low-margin product, so we have it on low priority after the accelerators. If you want Z3 Ram "now", ZorRAM is available "now". Production is running, so if you have pre-ordered BigRamPlus, you can be sure that you will get it.