12 weeks is the safest bet. Deca hangs around for ages even low traces can still mess with your bloods. Wait it out if you want that test to show your true baseline.
From reading your posts and pics, all looks good and you're on the right track. TRT will 100% help with body recomp over time, especially once your levels stabilise. At your current bf, staying in a small deficit makes sense until you’re closer to that 20% mark.
Biggest game changer for you now...
I can see :)
Your approach to your transformation is smart. You’re taking it slow, staying consistent and doing all the right things. That’s exactly how you build long term results.