I still have 12 lemons. It's April. The lemons don't seem to be getting any bigger or growing plus I have no new leaves or blooms. My second tree a year older had both new leaves and blooms. Both are still in the house as night temps are too cool to go out side yet. Both are in sunny windows
Meyer Lemon Tree
Certified GKH Gardening Expert
Give them as much sun as possible indoors, a grow light can aide in light until they can move outdoors.
Remember to slowly acclimate them to the outdoor move.
Here are some links with more information.