Each day of Phase #3, once you've finished reviewing your flashcards, you can move onto studying Chain Items 2 & 3, listening and speaking/grammar. These items will probably get quite enmeshed with part of your flashcard approach, because listening and speaking/grammar practice will serve as a source for new words to add to your Anki deck and new kanji to study. Still, you should not study listening and grammar until you've studied all of the new and review flashcards on Anki for a given day.

You don't ever want to risk missing a day of new and review flashcards, because it will jeopardize this entire mastery plan. It's not the end of the world if you go a day without studying listening and/or grammar. It is the end of the world if you go a day without doing your (review) flashcards.

With all that flashcard business aside, then, let's talk about listening practice.

Chain Item #2 is great, because it's so simple: 1 audio lesson per day, minimum.

As you know, I prefer JapanesePod101, but there are a plethora of other options available as well. However, since JapanesePod101 is the only audio lesson resource that I use, that's all I'm really capable of explaining in-depth. A lot of the advice I'll give here, however, is applicable to pretty much any suite of audio lessons for any language. So if you find that there is a different audio series that appeals to you, then just apply this advice to that series.