Just curious how long you waited before your upgrade M4 Pro order stayed in "processing". I ordered mine (48GB RAM, 10GbE upgrades) on 29 November and on 8 December, it's still "processing", with an estimated delivery date of 13-18 December. Given the shipping times (at least 7 days?) it looks likely to be towards the end of this range, but the holiday parcel traffic may slow things down.