Why does the Torah again repeat the fact that Noach did everything that HaSh-m commanded him?
Rashi: This time it refers to his entering the Ark. 1
Ramban #1 (to 7: 8-9): It refers to the trouble he went to fetching the Tahor animals and bringing them to his house. 2
Ramban #2 (to 7:16): It refers to all the details spelled out in verses 7: 6-11 (which are not a narrative).
Rashi writes: "This refers to his coming to the Teivah." Later however, Rashi (to 7:7) writes that Noach did not enter the Teivah until the water pushed him in?
Gur Aryeh: In this verse, Noach approached the Teivah, but he did not yet enter it, until verse 7:7.
רש"י: זה ביאתו לתיבה: קשה שבפסוק ז' כתב רש"י שנח נכנס לתיבה רק כשדחקוהו מי המבול?
גור אריה: נח בא עד התיבה ועדין לא נכנס אליה עד שדחקוהו מי המבול.