Since no one has answered yet, perhaps let a novice share his first thoughts.
In the US, an average contemporary high school student learns the whole of the basic grammar in two years (by working through a comprehensive textbook) and read authentic/adapted texts in their third year. Since every textbook makes its own choice of the sequence in which grammar and vocabulary are introduced, it is not easy to say what it is expected from a given learner who has completed 1 year of Latin.
A brief look at the table of content (and this only!) shows that Lesson LVIII may be a plausible point to pause. If you are far from it, it would be better to pause at Lesson LII than rushing. However, as you are learning from Mr Linney, so why don't you write directly to him? I imagine he would be contented to know, in person, that a budding Latinist is benefiting from his lectures.
By the way, in learning generally, and language learning in particular, it may not be a good idea to "stop". Since you are a homeschooler, you enjoy greater flexibility than the others. If you are dedicated to Latin, learning (and reviewing) small bits every single day is the way to success. And if you would like to know whether you are on par with SECOND-YEAR highschooler, you could read from front to cover the Revised Latin Primer by Benjamin Hall Kennedy and see if you understand everything.