We only talk on the phone for now (not facetime, regular old phone call). My T has never been a fan of doing deep work over the phone, we used to have phone calls before that and they were usually just short, supportive exchanges.
Now, we talk for a bit longer, but still not full session length, something like 15-20 minutes.
He checks in with me on how I'm doing, but as he's said yesterday, while most of his other clients are really struggling, I am doing great right now. So after a few short questions on how I'm doing and how I'm spending my days, we then usually start talking for a bit about the current situation in our country and the surrounding ones. Sometimes we discuss some new studies on the virus that we've both read, he also asks for my opinion on things like masks or how long I think the lock-down will go on for (I was his first client to say I'll isolate at home, while he still thought it'd probably never be necessary here, so now he assumes I'm well informed). We also discuss the precautions we both take, he currently tends to share a lot more than usual about himself (like that he took the car to work, how he usually comes to work, what's it like for him to be at home so much...).

Overall, it's not really therapy per se, we stay in contact, which makes me feel good. We don't go into difficult topics right now, but that's okay, it'd be weird over the phone anyways. I also feel I can help him just a tiny bit by exchanging information. Plus it's probably a nice thing to have a few clients who are not currently freaking out, I imagine that having so many people who aren't doing well and can't see him is hard for him.