Is the latter rain before or after the national Sunday law?

Laws to Exalt the False Sabbath.--We are to be ready and waiting for the orders of God. Nations will be stirred to their very center. Support will be withdrawn from those who proclaim God's only standard of righteousness, the only sure test of character. And all who will not bow to the decree of the national councils, and obey the national laws to exalt the sabbath instituted by the man of sin to the disregard of God's holy day, will feel, not the oppressive power of popery alone, but of the Protestant world, the image of the beast. . . . {3SM 385.2}
The great issue so near at hand will weed out those whom God has not appointed and He will have a pure, true, sanctified ministry prepared for the latter rain. . . . {3SM 385.3}

There must be no neglect of the grace represented by the former rain. Only those who are living up to the light they have, will receive greater light. Unless we are daily advancing in the exemplification of the active Christian virtues, we shall not recognize the manifestations of the Holy Spirit in the latter rain. It may be falling on hearts all around us, but we shall not discern or receive it. {FLB 333.6}

At the commencement of the time of trouble, we were filled with the Holy Ghost as we went forth and proclaimed the Sabbath more fully. LDE 143.1

The time of test is just upon us, for the loud cry of the third angel has already begun in the revelation of the righteousness of Christ, the sin-pardoning Redeemer. This is the beginning of the light of the angel whose glory shall fill the whole earth. For it is the work of every one to whom the message of warning has come, to lift up Jesus, to present Him to the world as revealed in types, as shadowed in symbols, as manifested in the revelations of the prophets, as unveiled in the lessons given to His disciples and in the wonderful miracles wrought for the sons of men. Search the Scriptures; for they are they that testify of Him.(1SM 362)

“I received a letter a little while ago from Brother Starr in Australia. I will read two or three sentences because they come in well just at this place in our lessons: ‘Sister White says that we have been in the time of the latter rain since the Minneapolis meeting’” (General Conference Bulletin, 1893, p. 377).

Maybe both?

The outpouring of the Spirit in the days of the apostles was "the former rain," and glorious was the result. But the latter rain will be more abundant. 8T 21 (1904)

When one who is supposed to be led and taught by God turns out of the way, because of self-confidence, many follow his example. His false step may result in misleading thousands. Consider the parable of the fig tree: "A certain man had a fig tree planted in his vineyard; and he came and sought fruit thereon, and found none. Then said he unto the dresser of his vineyard, Behold, these three years I come seeking fruit on this fig tree, and find none: cut it down; why cumbereth it the ground? And he answering said unto him, Lord, let it alone this year also, till I shall dig about it, and dung it: and if it bear fruit, well: and if not, then after that thou shalt cut it down." Luke 13:6-9. "Then after that." In these words there is a lesson for all who are connected with the work of God. A period of probation was granted to the tree that bore no fruit. And in like manner God bears long with His people. But of those who have had great advantages, and who are standing in positions of high and sacred trust, and yet bear no fruit, He says: "Cut it down; why cumbereth it the ground?" Let those connected with the Lord's special instrumentalities remember that He will call for fruit from His vineyard. Proportionate to the blessings bestowed will be the returns required. Heavenly angels have visited and ministered in every place where God's institutions are established. Unfaithfulness in these institutions is a greater sin than it would be elsewhere, for it has a greater influence than it would elsewhere have. Unfaithfulness, injustice, dishonesty, conniving at wrong, obstruct the light which God designs shall shine forth from His instrumentalities. {7T 200.5}

PS - Gordon Collier is my uncle. I can ask him questions if you wish.

This argument will appear conclusive; and a decree will finally be issued against those who hallow the Sabbath of the fourth commandment, denouncing them as deserving of the severest punishment and giving the people liberty, after a certain time, to put them to death. Romanism in the Old World and apostate Protestantism in the New will pursue a similar course toward those who honor all the divine precepts. {GC 615.2}