Apologies if it's bad form to quote myself, but we're now at 10-12 weeks here for the above config.
I've been following estimated dates since the Apple Store opened up again when the event finished and I saw ... first all configurations were 18 Mar or 21st-23rd March, some hours later, the M1 Ultras were delayed to late April, yesterday morning anything with 64GB of RAM or more as well got late May, just M1 Max with 32GB can get early/mid April as it is now. Anything with 64GB RAM or more currently is 10 to 12 weeks, crazy sales, or not too much stock to begin with.
I was tempted to cancel my M1 Max 24 GPU 32GB // 1TB (MBP 14") in favor for these ones when I saw the first hour estimates, but now, it's even crazier than with MBPs ... and given I'm on the 6th waiting week and a "portable Mac Studio" is arriving to me and I needed a laptop update, I'm gonna stick with it and forget the Mac Studio till months later or maybe some generations later.
edit: Good luck with all your shippings and orders, and congrats to the first ones that ordered it fast, the waiting game is really hard