Wow, they look fabulous now. Well done on the save. Get your little paintbrush ready and "diddle" those flowers once you can see visible pollen.
If I might suggest, to keep the plant growing through your short days and low light winter months you might want to invest in a grow lamp for it. Give it extra light on cloudy days, and a couple of hours more "daylight" as well. Down here, lemons and limes grow pretty much year round although they do slow down a lot if it gets cold in winter (below 40deg. F at night is "cold" right?)
Mine used to bloom pretty much year round, off and on too. It died of Citrus Greening disease, sadly. Something you won't have to worry about.