On Hand Meaning

(idiomatic) Available; ready; in stock.

Example:   If you have cornstarch on hand, use it; otherwise, try a little flour.
2011 September 29, Tom Rostance, “Stoke 2 - 1 Besiktas”[1], BBC Sport:
  Rustu failed to collect a Whitehead corner, Shawcross saw his effort blocked and Crouch was on hand to bundle over the line from three yards out.