How is the new True Strike attack roll calculated?

I am making a cleric with the magic initiate feat, and I took True Strike as a cantrip. Do I add proficiency to the attack roll?

I am wanting to attack with a quarterstaff that I have proficiency with, so do I add my +3 wisdom mod and +2 proficiency bonus for the attack roll?

Yes, you're right.

And True Strike requires in fact to use a weapon with which you have proficiency, according to the spell components.

Components: S, M (a weapon with which you have proficiency and that is worth 1+ CP)

There is a related thread here: Does True Strike (2024) substitutes the Weapon Proficiency needed for weapon usage?