Got this new delta printer kits yesterday, and now just let the fast bed mesh works with BD sensor. all you need to do is update the BDsensor software from github, the difference between the normal XYZ printer and delta is the bed_mesh configureation in klipper.
For example:
[bed_mesh]
speed: 200
horizontal_move_z: 1
mesh_radius: 80
mesh_origin: 0, 0
round_probe_count: 5
[delta_calibrate]
radius:100
horizontal_move_z: 20
speed:50