#At the end of the casting of a spell

The important thing is the quote you mention in your question:

immediately after you cast a sorcerer spell of 1st level or higher (PHB, pg. 103)

It says "after you cast", so any time before that you are casting the spell, and only once the spell's casting has been completed have you cast the spell.

At the end of the casting of a spell

The important thing is the quote you mention in your question:

immediately after you cast a sorcerer spell of 1st level or higher (PHB, pg. 103)

It says "after you cast", so any time before that you are casting the spell, and only once the spell's casting has been completed have you cast the spell.

#At the End of the casting of a spell

The important thing is the quote you mention in your question:

immediately after you cast a sorcerer spell of 1st level or higher (PHB, pg. 103)

It says "after you cast", so any time before that you are casting the spell, and only once the spell's casting has been completed have you cast the spell.

#At the end of the casting of a spell

The important thing is the quote you mention in your question:

immediately after you cast a sorcerer spell of 1st level or higher (PHB, pg. 103)

It says "after you cast", so any time before that you are casting the spell, and only once the spell's casting has been completed have you cast the spell.

#End of casting a spell

The important thing is the quote you mention in your question:

immediately after you cast a sorcerer spell of 1st level or higher (PHB, pg. 103)

It says "after you cast", so any time before that you are casting the spell, and only once the spell's casting has been completed have you cast the spell.

#At the End of the casting of a spell

The important thing is the quote you mention in your question:

immediately after you cast a sorcerer spell of 1st level or higher (PHB, pg. 103)

It says "after you cast", so any time before that you are casting the spell, and only once the spell's casting has been completed have you cast the spell.