You can work it out.
In the 1911 census there were 34,043,076 people in England and 2,032,193 in Wales.
Doing exact searches for Smith (not Smyth or Smythe) in various services brings up broadly similar results:
Ancestry: England 511,488 Wales 16,545
FindMyPast: England 501,002 Wales 16,326
The Genealogist: England and Wales together 519,788