Does static ability from an enchantment apply the moment it enters the battlefield?

Static abilities function continuously while the permanent is on the battlefield. According to CR 611.3, static abilities generate continuous effects that simply apply — there is no 'activation' step and no waiting for a trigger to go on the stack. The moment an enchantment resolves and enters the battlefield, its static abilities are 'on.'

This is different from triggered abilities (which use 'when/whenever/at') or activated abilities (which require you to pay a cost). A static ability such as 'creatures you control get +1/+1' just applies as a layer effect the instant the enchantment exists on the battlefield (CR 604.2).

There is one important nuance: if the enchantment's own entry somehow depends on a condition that isn't met at the moment it enters, the ability still applies — it simply may have no relevant objects to affect yet. The ability is still 'on' from that instant (CR 611.3a).

Concrete example: You cast Glorious Anthem, which gives all your creatures +1/+1. The moment Glorious Anthem resolves and enters the battlefield, every creature you currently control immediately gets +1/+1. You do not need to wait for your next turn or for any trigger to resolve.

Summary of relevant rules: CR 604.2 (static abilities apply continuously), CR 611.3 (continuous effects from static abilities), and CR 611.3a (effects apply as long as the condition is met).