Just don't overwater.

I don't understand if they'll be growing indoors or outdoors (you say 'outside' but you also say 'window').

You'll need to slowly acclimate them to full sun (if outdoors) over a period of 4 weeks or so. Full sun at those temps might even be too much for them. I'd give them more shade if I were you.

Keep in mind Meyer Lemon seeds do not grow true to type, so what you have is not a Meyer lemon, but some mix up of the genes in the Meyer lemon hybrid. It may or may not ever bloom for you. Fruit may be inferior.

Nevertheless, it should make an interesting foliage plant.

Thanks. Will keep it on balcony with partial shade. Lets see if it flowers and bears any fruit