It has been years since I have had a puppy. I think when my Ridgeback was young I fed him 4 times a day until he was 12 weeks old and then cut back to 3 feedings up until 16 weeks old, does that sound about right for GSD's?
For most puppies, feeding 3 times a day is belived by most to be best. Once in the morning, once in the afternoon and once in the evening. I generally feed 3 times a day until they are 5 or 6 months old then cut back to twice a day (morning and evening).
Congradulations on your new puppy! Pictures are always encouraged!!
If you are home in the afternoon to feed an afternoon meal that is great. I raised 6 GSD's pups over a 12 year span for a local guide program and 3 of my own pups over 20 years and only fed them 2 times a day. No one home in the afternoon to feed 3 meals a day. Easier to potty train too I think. It all depends on your schedule.