Temperatures have been cool and they have probably slowed down because of it. In about 3 weeks, plants are only about 1/4" tall, so the growth is still very slow. In less than a week, most of my 50 cells showed green sprouts, and within two weeks, nearly all did as well.
As soon as I placed the seeds in the peat tray, I made sure the soil was thoroughly moist. In order to keep the top layer of the soil moist at all times, I misted the newly planted seeds at least once per day using a spray bottle. I found this to be an exceptionally easy method for controlling the planting of these small seeds with good precision, and I certainly had success with it. Even so, the two cells that didn't germinate quite possibly did not transfer seeds. It is impossible to tell if all the seeds have been transferred since your finger is now covered in dirt, but that is why I tried 5 seeds at a time. In the seed tray, I pushed my finger lightly into the soil and then took out about 5 seeds at a time. So far, every single one of the 50 cells I planted has germinated several My method for planting the nearly microscopic seeds was to spread the seeds in a single layer on top of the jar lid and dab at them with a wet (but not wet) fingertip to help them adhere. Planting the seeds indoors in small seedling trays was my method of starting them. I was happy to see that I had a very high success rate for germinating thyme seeds after reading how difficult it can be.