I agree with Wis and erg that it's surprising that you will be starting practicum right away.
The way it will look will vary by state and even site. In my cohort, during all this, we had students who were not allowed to do telehealth from home and others who were. Many sites for the coming cycle who had a summer start date pushed it back by a month or more. Also, things are starting to open back up, so what sites have been doing may not be what they will be doing when you come on board. Number of hours per week will largely be dependent on your program, you, and your site. My program has guidelines regarding how many hours of practicum you can do per week which can be found in our handbook, I would recommend you read yours (for a variety of reasons). Supervision will also vary by site. You are entitled to 1 hour of supervision with a licensed psychologist for every 4 hours of direct client contact. Some sites give more, others may try to give less.