That is old school.

And I would just ask the printer.

It means art that is finally ready for the printer to make film and plates (or in this case, screens) to print from. In the old days, it would mean actually handing over the physical art to be shot with a stat camera. Now it just means handing or the finished digital file.

If they are asking for a hard copy; it is because they want something they can match colors too. Every printer and monitor show color differently. (This is even get this if the printer switched press or press-men.)

If sending out vector art, make sure that the file is set for CYMK and any spot colors are called out to whatever Pantone color matches they are suppose to be. You can make spot colors with their own names (like "my red color") but then it becomes a problem to the pre-press department to actually match that color to an ink. This can get expensive if they have to actually try and mix a special ink to match that color.

If sending out raster art, it needs to be AT LEAST 300 dpi at the actual size of the print. This is the industry standard. More than 300 dpi creates a file larger than needed. Lower you run the risk of it being too small to use without looking like crap. Never use any image made for web for print.

Most printing is done with CYMK. Some newer digital presses will even print in CYMKOV for a wider color range. But your range of color in CYMK is never going to match what you get with RGB. So if you are building your image in RGB, you are asking for trouble. Convert the file to CYMK if is not already. If a color needs to match perfectly (as in a corporate logo where certain colors have to always match) then make it a spot color.