Question about timewalking

I plan on doing the black temple tomorrow, but there’s something I can’t find the answer to, do you retain all of your talents despite scaling down in level? I wanted to take my warlock but I don’t feel like leveling her to cap(she’s 34 right now)

Also, am I supposed to level up the heart of azeroth?

Edit: Yes you keep your talents, and I didn’t see a single person with the heart, so if it does matter, most people don’t seem to care.