The line notation, Pt | H2(g) | H (aq) || Cu2 (aq) | Cu(s),
indicates that
copper metal is a product of the cell reaction.
hydrogen gas (H2) is a product of the cell reaction.
Cu is the anode.
Pt is the cathode.

copper metal is a product of the cell reaction.

Explanation:

In writing the line notation of a cell reaction, we ought to recall that the anode is placed at the left hand side of the notation while the cathode is placed at the right hand side of the notation.

If we look at the line notation shown in the question, we will realize that the Cu2+ (aq) | Cu(s) half cell is the cathode and that copper metal is the product of the reaction as shown by the notation.

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