I am already using this light in a 4x4 tent. any bigger will probably make the light bleaching even worse than it has been. it probably wont be an issue once the plants need more light.
Amazon shows it in stock and shipping, so I'm guessing you'll get yours on time.
if you have not already made a final decision i use https://smile.amazon.com/gp/product/B09MYJ8WWD/ref=ppx_yo_dt_b_asin_title_o06_s01?ie=UTF8&psc=1 for my 4x4x6