My Meyer lemon tree has green lemons on it. How long before the turn yellow?

SOURCE: When printing all the reds are coming out green

Magenta ink is not flowing. Go to your printer utilities (Control Panel>Printer and Faxes>your printer>Advanced and look for an option to clean the print heads. Or, replace the cartridge. If you haven't used the printer for a while (a few weeks maybe) ink can get clogged. Sometimes a bit of isopropyl alcohol where the opening is in the cartridge is enough to restore flow. Just a drop would be all you need.

SOURCE: My lemon tree has yellow leaves

Need ironiate get it at plant nursery

SOURCE: My lemon tree is full of fruit ,leaves are green with yellow marks on them,doesn't look healthy.What to do?

shortage of mineral in the soil
could be manganese, borax, or other items found in a citrus tree fertilizer
talk with a nursery showing them a few leaves