The LR workflow in the Develop module appears to recommend file sharpening before the original file is resized to its output size (capture sharpening). Then there appears to be another sharpening step in the Print module.
Do I still do LR sharpening in the Develop module if I'm going to do final output sharpening, say, either in Photoshop or Topaz?
Exactly. Non destructive instruction based capture sharpening in Develop for the full rez master. Output sharpening in Print based on output size requested with info about resolution, paper type etc. Optimized for ink jet! In Export dialog, sharpening can be optimized for screen. True for Web and slide show module. Pretty sure too that book module uses output sharpening like Print, but I don’t think it is optimized for halftone output.
IF you only want capture sharpening and then intend to render the image and output sharpen later (Photoshop), then of course, you’d size for the output and sharpening appropriately at that point.