It depends on their age and disposition. In general, if they can chat easily with family or friends through video chat apps, virtual lessons should be fine. I've found that oftentimes students find it a little more difficult to pay attention during virtual lessons since the teacher is not physically in the room.
Like in-person Suzuki cello lessons, virtual lessons benefit from the parent always being present to support and focus the student, troubleshoot problems (usually technology!), and take note of things that might assist my work with their child. Many students have been destabilized by the change in routine and safety procedures, so supporting them by cultivating a calm learning environment is important. Many students' minds can wander when looking at a computer monitor, phone, or tablet, so patiently guiding their attention back to those is sometimes needed. Lastly, sometimes video chats lag, or the student behaves in a peculiar way I might not have encountered but that the parents are all-too familiar with, and letting me know of these things will help me.
Please contact me if you have other questions relating to this!