"It depends" lol
If you're wanting to see some of the best online MTT players in action then I wouldn't suggest watching most of the big Sunday majors (cuz there's a ton of fish in them too... alot of recreational players & satellite winners).
Typically, MTTs like '$1K Monday on Fulltilt ($1,000 buyin)' "SuperTuesday on Pokerstars ($1,000 buyin)" The 1/4mill on Stars (Wed. $320 buyin) & on any given day, the $100rebuy > (1R/1A), or $150+15 buyin MTT, $100 rebuy, $100 bi, $30Kguar. "6-max" on Fulltilt... and on Sundays, "$200 rebuy on Fulltilt", (Sunday500 on Pokerstars ($500 buyin).
If you scroll down through the lobby on Fulltilt, clicking on 'running', then find a bigger buyin & check it out. Daytimes have stronger players (more regs.).. ie. daytime $75buyin is full of regs. where the one at night has alot of fish in there too, & most buyins $100 & up (especially once it's deeper into it) will be FULL of tournament regs. {btw.. the 'red pros' are definitely not the ones to watch in the MTTs, yes there are a handful of them who are also MTT online regs. & who do GREAT... but in general there are many more online regs. who are crushing the MTTs by comparison.
Another method you could use to 'watch the better Tournament players' is.. look up who the top online players are (there are leaderboards all over the place), pick a handful of names ranked in Top10 (or Top100, etc) then do a player search & check it out. Mement_mori, TedsFishFry, gboro780 are a few good ones to check out, but there's a ton of others too.