The short answer is: YES!
The great thing about Apple and their iCloud is that it will keep updating everything automatically. Without you having to manually sync everything if you make any changes. So if you've already sent everything to iTunes Match, don't worry!
You can still use CoverScout and SongGenie to fine tune your songs info, fix up those the useless "Track.-01" files and get those covers shining; iTunes Match will reflect the improvements very quickly and automatically after you're done!
P.S: A little handy tip is that if you ever want to force iTunes to update your newly "Genie'd" and "Scouted" songs, just play it in iTunes.
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