The one additional thing I forgot to mention is that random notes as per TFA are almost entirely unrelated to the activity of sight reading but random rhythms are not. I made myself a bunch of flashcards with every conceivable combination of notes and rests adding up to a crotchet/quarter note on each card. Then I would scramble the deck , set the metronome and deal myself out say 4 bars of 4/4. Then sing or tap the rhythm in tempo. That helped a lot for reading more rhythmically intense stuff.