When to sleep train my baby who is in daycare?

My almost 7 month old goes to daycare 5 days/week. Wake windows at home are 2.5/2.5/2.5/2.5-3ish, dwu 630, bedtime 730. At daycare his ww are usually 3 hours with two naps. We're often not able to squeeze in a nap between daycare pickup and bedtime and that last ww can get very long. Whether it's a daycare day or not, his sleep has completely gone down the tubes with more night wakings and early wake ups. So we're planning on sleep training and eventually decreasing night feeds.

Given the variability in his schedule, is it better to wait for a long weekend to sleep train so he has 3 days of naps that are more easily controlled at home? Or just go ahead with sleep training on whatever weekend we can swing it? I'm desperate for any improvement.