What does "at hand" mean? Is it an idiom?

[Omani]

English Idioms and Expressions, Intermediate level

ESL/EFL Test #19 "Idioms with Hand", question 5

The beginning of a new generation of computer software is at hand.

(a) imminent
(b) remote
(c) current
(d) in someone's possession

English Idioms and Expressions, Intermediate level

ESL/EFL Test #19 "Idioms with Hand", answer 5

The beginning of a new generation of computer software is imminent.

Correct answer: (a) imminent
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can you explain it,

Omani

[Mister Micawber]

.
At hand = imminent; close by; near; soon in time.
.
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Native English teacher at Mister Micawber's