prepositions - Question about the future “tense”

My daughter, who is in the 4th grade, was asked to answer questions about the following sentence:

What time can you meet us at the school on Tuesday?

She was asked questions about the usage of can and meet in the sentence. Specifically, she was asked whether the words were action, linking or helping verbs, and then she was asked whether those words were past, present or future tense.

Apparently, they are teaching a future “tense”.

My questions:

1. Are can and meet past, present, or future tense in this sentence?


2. Should this sentence begin with the preposition at or is it correct as written?