The Meccan Revelations: Page 515 from Volume One

He prevented a people from prostrating during the times during which it is forbidden to pray, and He permitted a people to prostrate after the afternoon prayer and after the morning prayer, unless the sun approaches setting or rising, which I say by prostrating at all times because the prohibition is related to prayer, and prostration is not part of prayer according to Islamic law except during prayer, and it is also permissible to recite it. Al-Fatihah at all times, even if reciting it during prayer is part of the prayer.

Considering this chapter

Prostration is an act of familiarization and exaltation of what God deserves of transcendence and elevation above the attributes of new things. Such a person is not restricted to a time without a time, but rather The attribution of His glorification and reverence to the times alike, just as the servant can commune with his Lord by reciting His Mighty Book at all times, and he is praiseworthy for that and rewarded by God Almi