Bitcoin is a legal tender in El Salvador for all transactions and tax payments
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I can see why they would want to adapt to ₿. The remittance companies like Western Union have the audacity to ask for 20% (no joke) when sending money from say the US to El Salvador.
₿ transactions over Lightning or over Liquid are virtually free. Quite a difference for a poor country!
You're right that the law would come into effect in 90 days, based on El Salvador's president's tweet of the bill translated in English.[1]
[1] https://twitter.com/nayibbukele/status/1402446890466217985
EDIT: The bill was approved (62 AYE / 22 NAY).[2][3]
[2] https://twitter.com/nayibbukele/status/1402507380710051840
[3] https://twitter.com/elsalvador/status/1402507585807433728