New...when to test?

I'm pretty new to T2...just dx 2 weeks ago. On top of that, I have had Stage 4 lung cancer since 12/2018 (completely stable under treatment). I gained a lot of weight because my treatment makes me hungry and I'm on anti-depressants that cause the same problem. I'm well on my way to losing weight...lost 5# this week. Edited to say: I'm on 1000mg Metformin a day. I take them after dinner.

Anyway, my question is: I only test when I wake up. Should I be testing other times during the day?

Thank you!