No for your first question and Yes for the second question. You are right, one of the usage of present perfect is the one you mentioned, however, the present perfect is used here because you are talking about experience to date. A good example for present perfect describing an action done recently can be EX.
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LaboriousHonestly speaking, this is the first time I have tasted such a delicious dish.Here is the implication.
CalifJimI have never tasted such a delicious dish [before / until now].That means If we use 'before' in that sentence or in a sentence that has the same structure as the above sentence has, then we can't use 'until now', and if we use 'until now', then we can't u
LaboriousIn other words, we can't have both, 'before' and 'until now', together in one sentence.Correct.
LaboriousYes, but I may not be able to get to them until later.
CalifJimYes, but I may not be able to get to them until later.OK, teacher. And thanks, I'm not in a hurry.
LaboriousThis is the first time I am doing X.This is OK, but the present and present continuous are unusual in this context. This was the first time present-oriented tenses is not OK. Just use That was ...+ a past-oriented tense, as shown below.
Laboriousbetter to use 'that' in place of 'this'Yes. Those you