They all have (had) them in stock, but demand has been strong. I think your best bet is to contact them directly to see lead times. And thanks for your order! I think you'll be pleased
I just spoke with Tequipment. Sure enough, however it works out, R&S is shipping to them (shipped out today, they say), then they will forward to me. Sounds like a couple of days for them to get the scope from the R&S warehouse. I'll bet the one or two they may have had in stock were snapped up within minutes of the bundle announcement.
The larger screen and higher resolution of the RTB2000's are making that default of 10 vertical divisions possible, vs the 8 on the Keysight and on my Rigol 2000 series here. Wow, no more doing math in my head like "what is 5 volts divided by 8 divisions?" Now I just move the decimal. And those on-screen division labels! You guys are making this easy. Isn't using a scope supposed to be a struggle?
So you now have some customer proof that the RTB2000's are pulling some sales away from the below-350 MHz portion of the Keysight 3000 series as well as the 2000's. I know the 2000 was one of the direct compare marketing sheets. For me the higher waveforms per second, higher sampling rate, more math functions, and (available at least) power analysis software lost out to the bigger (still touch!) screen, 10 bit ADC, more memory, price! (especially this bundle), MSO capability without having to buy the next $1.5K more MSO model up, and now lower noise floor.
EDIT: Even having a set of vertical controls per channel on the Keysight lost out to the single set on the R&S. I folded like a cheap suit on that requirement when the bundle came along.