The Metamagic Adept feat (TCoE, p. 80) lets you "learn two Metamagic options" and gives you "two sorcery points to spend on Metamagic".
The 2nd-level sorcerer feature Font of Magic gives them 2 sorcery points and allows them to convert between sorcery points and spell slots, but they don't learn any Metamagic options until they reach 3rd level.
If a character with 2 levels in sorcerer had also taken the Metamagic Adept feat, could they use all 4 of their sorcery points for the Metamagic options they learn from the feat?
(I understand that few 2nd-level sorcerers would have a feat, or have invested it in Metamagic Adept. This is mostly for high-level multiclass characters that can't spare a 3rd level for a sorcerer dip but want more Metamagic than the feat alone can give, along with the ability to convert spell slots into more sorcery points – like a Wizard 18/Sorcerer 2 build I am considering for a one-shot.)
Best Answer
Sorcery Points may be used for Metamagic you know, no matter your level.
Consider my favorite Metamagic, Quickened Spell:
Observe that Quickened Spell does not care where the sorcery points came from. If you know the Metamagic, then you can use your sorcery points on it, because the Metamagic does not discriminate.
In contrast, other sorcerer features do discriminate, because of what is written in the feat:
The points from the feat can only be used for Metamagic. The points from the class have no such restriction. Sure, sorcerers usually do not have access to Metamagic until 3rd level, but 5th Edition has a specific-beats-general rule:
Generally, sorcerers don’t have any Metamagic until 3rd level, but the class description doesn’t say they can’t use Metamagic before then, the only barrier is that they don’t know any. Metamagic Adept overcomes this barrier by teaching you the Metamagic, providing a specific rule allowing you to use Metamagic, overriding the general rule that 2nd level sorcerers don’t know any Metamagic.
Another helpful way to think about this is:
A Variant Human warlock could take Metamagic Adept at 1st level and immediately have access to the sorcery points and metamagics gained through the feat, so we should not expect that being a sorcerer would prevent that availability, even at 1st level.