It's definitely an option. When I used to grow Malawi, it was a necessity-those big girls really seemed to ripen in stages and took forever. If you lollipop your branches, you won't have enough larf growing beneath the canopy to make it worthwhile, but if there are a lot of lowers growing, you just have to decide for yourself if there is enough to make it worth it, or if you should just harvest when the tops are perfect and make hash from the larf. If you have another set of plants ready to go into your main tent, then I would just harvest it all and get the new plants going, but if you don't have new plants for the space, then by all means, it's great to harvest in stages.