Yup, I get the same commands. If you're using -smp 8, it can take a minute or two before the WU is downloaded so you might not see it in top. If after two minutes it's not there, look up in Terminal and make sure you started the client correctly. So many times I've entered -smp8 and nothing happened. :P
Also, make sure you're in the correct directory. If you only did hoth's guide, you'll need to do cd fah before you run nohup. However, if you followed Jedix's HFM instructions (post #35 IIRC), you'll need to do cd /fah before running nohup; fah and /fah are different directories.