Export the images from inside Lightroom. This is one of the things it is there for - doing stuff with the results of your work; be that printing onto paper), saving copies to disk or into a web gallery or whatever. This does not involve any intermediate step, you just go straight to your desired end result.
You can select the flash drive as your destination and brand new file versions will be saved directly there, each one showing its latest editing as performed in Lightroom.
One can think of this, as an electronic equivalent of 'printing' all of these images: printing them as you currently see them.
You can select a file type (such as, JPG), a colourspace (such as, sRGB), a compression in the case of JPG (such as, 80), resizing (such as for screen size viewing, e.g. 1680 pixels width x 1280 pixels height - LR will then make each image fit within that box limit); any file renaming, with compensatory sharpening, and suchlike matters. Or whatever else is your requirement.
If this export setup is something you think you may do again, e.g. to refresh the same flash drive with some new images or to replace the same images when you've done some further editing - you can save the entire Export dialog's setup as a named (user) Import Preset, which makes it easy and consistent to then recall all these same settings and use them again, in the future.
One further note: in the "file type" menu of Export, there's a choice "Original". This presumes something that will be further edited, rather than an end result output. IIRC "Original" does not work quite the same as the other choices, in that it merely copies the source imported file while appending Adobe editing metadata to that. It doesn't construct a whole fresh image file. So depending how someone then views that, they might possibly see your LR edits but would more likely not. But the more conventional format (JPG) is both compact, and also universally compatible.