It is permissible to circumambulate the Ka‘bah (tawaf) at any time, day or night
Question

Is it possible for a person to do ‘Umrah at any time of the day or night? Or must the actions of ‘Umrah be done at a specific time of day?
What I mean by my question is:
All the actions of ‘Umrah are obligatory, so is it possible for a person to do tawaf (circumambulation of the Ka ‘bah) after ‘Isha’ prayer, if he reaches Makkah before ‘Isha’ time?
Praise be to Allah.There is no specific time for circumambulation of the Ka‘bah (tawaf); rather whenever a person who wants to perform Hajj or ‘Umrah, or the person who wants to perform tawaf, reaches the Ka‘bah, he may perform tawaf at any time he wants of the night or day, even if that is during the times when the prayer is disallowed, because the Prophet (blessings and peace of Allah be upon him) said: “O Banu ‘Abd Manaaf, do not prevent anyone from circumambulating this House or praying at any time he wants, night or day.”
Narrated by at-Tirmidhi, 868; classed as saheeh by Shaykh al-Albaani. 
And Allah knows best.