The answer to this question is provided by the grammar of the statement itself.
In Mark 10:30, we have the phrase, "now in this time/age" involves the demonstrative pronoun, τούτῳ (in its dative masculine singular form) which simply means "this", ie, what has just been spoken about.
Therefore, "now in this time" simply means, as Barnes correctly observes:
In this time - In this life. In the time that he forsakes all.
The presence of the adverb νῦν (nun) = "now" serves to emphasize this conclusion. Now, before rushing to overly literal conclusions, Barnes goes on to observe:
Houses ... - This cannot be taken literally, as promising a hundred times as many "mothers, sisters," etc. It means, evidently,
that the loss shall be a hundred times "compensated" or made up; or
that, in the possession of religion, we have a hundred times the
"value" of all we forsake. This consists in the pardon of sin, in the
favor of God, in peace of conscience, in support in trials and in
death, and in raising up "friends" in the place of those who are left
- "spiritual brethren, and sisters, and mothers," etc. And this corresponds to the experience of all who ever became Christians. At
the same time. it is true that godliness is profitable "for all
things," having the promise of the life that is, as well as of that
which is to come.
The Pulpit commentary arrives at a similar conclusion:
He who forsakes his own for the sake of Christ will find others, many
in number, who will give him the love of brethren and sisters, with
even greater affection; so that he will seem not to have lost or
forsaken his own, but to have received them again with interest. For
spiritual affections are far deeper than natural; and his love is
stronger who burns with heavenly love which God has kindled, than he
who is influenced by earthly love only, which only nature has planted.
But in the fullest sense, he who forsakes these earthly things for the
sake of Christ, receives instead, God himself. For to those who
forsake all for him, he is himself father, brother, sister, and all
things. So that he will have possessions far richer than what earth
can supply
There is an interesting and significant addition from Jesus: Despite receiving a hundred-fold more, the true Christian will still have his life "with persecutions".