In short yes.
In more detail.
The car parks and trails are open, they’re got more info on different websites for each centre, but as some of them are commercial, some public and all under different control it needs a bit of work.
For example Cwmcarn trails are open, the uplift is not (and likely won’t be for a long time as the Sole Driver / Owner’s wife has a respiratory problem so is shielding for the foreseeable) the centre and toilets are closed until Monday.
Afan trails are open, the cafe and toilets are not, the cafe is preparing to open for take-aways, no word on the Toilets yet.
As for the trails, some are very over-grown and rough due to recent rainfall, like rough enough that you might just find a 2ft drop into a lot of loose rocks on a trail that would have been pretty smooth TC type stuff last time you were there.
Cwmcarn has had a LOT of work during lockdown so large bits of it are/were closed and diverted which isn’t reflected on their website yet. Also, and I’m not making this up, they don’t actually know if the new Blue trail is open or closed, or at least Bob the Ranger who manages their communications doesn’t.