Today is the day of salvation. So I would say pray for the living to be comforted in their losses and pray for the spiritually dead to become alive in Christ.
Young's Literal Translation
for He saith, 'In an acceptable time I did hear thee, and in ***A*** day of salvation I did help thee, lo, now is a well-accepted time; lo, now, ***A*** day of salvation,' -- (2 Cor 6:2)
For He is saying, "In a season acceptable I reply to you, And in a day of salvation I help you.Lo! Now is a most acceptable era! Lo! Now is a day of salvation!" (CLV)
For he saith—In an approved season, have I hearkened unto thee, and, in a day of salvation, have succoured thee;—Lo! now, a well-approved season, Lo! now, a day of salvation: (Rotherham)
If it is "a" day of salvation that doesn't equate to "the only" day of salvation.
If today is "a" day of salvation, tomorrow may be another day.
To the Lord a day is as a thousand years (2 Pet.3:8).
Now is "a" day of salvation. The present moment is always "now", whether today or in a 1000 years after Paul wrote that or in 3000, 5000 or 10,000 years after he wrote it.
1Pet.3:18 For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but quickened by the Spirit:
19By which also he went and preached unto the spirits in prison;
20Which sometime were disobedient, when once the longsuffering of God waited in the days of Noah, while the ark was a preparing, wherein few, that is, eight souls were saved by water.
4:6 For for this cause was the gospel preached also to them that are dead, that they might be judged according to men in the flesh, but live according to God in the spirit. (1 Peter)
1 Timothy 4:10 For to this end we toil and strive, because we have our hope set on the living God, who is the Savior of all men, especially of those who believe. These things command and teach.