You might have to ask the folks that run that channel. Given the fact that there wasn't even a Barker Era channel this time 40 days ago, I don't think it's a big deal at all. If I had to guess, they'll get to it when they get to it.
I assumed that if they were going to do it, it would've happened on Monday. I don't imagine they'll start tomorrow, so the earliest, most logical spot that Pluto would move onto 02/08/83 and beyond would be Tuesday around 8 AM EST.
Someone like you and I (or me) wouldn't necessarily be happy for the fact that they've been on this same loop. A couple things, however. As mentioned in the past, a casual fan whose life includes a lot outside of TPIR but admired the classic years of the show would be okay with what they're doing now. They might catch a couple episodes a week and then that would be enough to satisfy their viewing of a 1982 episode of TPIR in the year 2021.
For the super-fan, you'd want more, and that's understandable. However, as of right now, I have the option to go to YouTube to catch what's on there. I do that every-so-often, but not every hour of every day of every week. Pre Barker era, that's been the best option for me, and I can't thank TPTB at CBS, Fremantle, the show itself, and whomever else that they've allowed it. It'll be sad when that changes, but I'm thankful that they've okay'd it for the past several years up to this point