For macro-porous bone scaffolds in general there can be found a range between 200 and 1000 um in pore size. 200 - 600 um presents the highest capacity for cell growth and bone formation (Tan et al. 2005).
It depends for which kind of bone and which kind of repairing (usually according to the size of the defect, you can determine the thickness)
It also depends of the size of the pores and the type of the mterials you used.
If you ask only for research, for each properties, like mechanical properties, cytotoxicity, biodegradibility, and so on, yes there are some standards which you can find easily.
And for bone tissue reparing in vivo, there are also some standard sizes (again depending which animal or which bone) named "critical-size bone defect"
If you search that, depending on your purpose, you can easily find it.
Thats depend on the methods of fabrication used in my opinion there is no standard for example the 3d printing and electrospinning each give you different parameter. The final decision is made after performing test on your specimens.