"What time in the morning do you guys drink tea?"

Translation: 你们上午几点喝茶？

[hdDlD]

Does 上午几点你们喝茶 work?

[L3opold]

woldn't fit 早上 better than 上午？

[WillowsofXihu]

早上 does mean morning specifically rather than 上午 as AM or the first half of the day, but when we say "in the morning" like this in English we often mean as opposed to "in the afternoon", so 上午 is appropriate here (besides flowing slightly better than 早上 within the Chinese sentence).