best high pass filter topology to extract low V kHz range pulse from noisy 60Hz line voltage before daq
I'd definitely not bother too much on analog filtering.
24 bits is such resolution that you get some 20 uV resolution even on the plain full input spectrum.
Mains network own noise is far above that even in the 1 kHz- 10 kHz band of interest due the heap of switch mode power supplies and lamp drivers connected.

(Reserch gate https://www.researchgate.net/publication/289721425)
This sample shows noise in the range of millivolt in that band.
So all in all I'd rather go for a simple first order highpass tuned on 100 Hz (approx -6dB on the 60 Hz fundamental, i.e. approx 10 uV resolution).
Then you'll have to struggle on the digital processing, here you can deploy a pretty brickwall shaped filter and /or some FFT and/or some syncronous demodulation scheme trying to recover the informations you are after.
And do not forget an anti-aliasing low pas filter, as you can see there's plenty of rubbish on the highside of spectrum too.