It is mid march but I didn't saw any moderator election out yet. When does elections for moderator start?
Moderator elections are not guaranteed to happen every year. They happen only when necessary.
The community team periodically looks at the work load on graduated sites and will reach out to the moderation team if it looks like more help might be needed. Broadly, it's up to the moderation teams to indicate whether they need additional hands, and how many sets of hands would be ideal.
Although we'll reach out to moderators on the anniversary of their last election, just to see how they're doing, elections do not always take place at the same time every year. Sometimes a year can even go by without any election at all. Most elections are scheduled as a result of moderators reaching out to Stack Exchange to ask for additional help. (source)