I claim the ornamental design for a telescoping cart cover, as shown and described.
FIG. 1 is a perspective view of a telescoping cart cover showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a right-side elevation view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a back elevation view thereof;
FIG. 6 is a left-side elevation view thereof showing the telescoping cart cover in a retracted position;
FIG. 7 is a perspective view of the telescoping cart cover in an extended and lowered position; and,
FIG. 8 is a side-perspective view showing the telescoping cart cover in an extended and lowered position.
The evenly dashed, closely-spaced broken lines on the telescoping cart cover illustrate stitching and form part of the claimed design. The remaining broken lines in FIGS. 6, 8 illustrate environmental structure and form no part of the claimed design.