Leaning to construct sentences using the word, stay behind, freezer, closing time and etc

[St8762]

We need to stay back/behind until late in the night to finish up all the tasks that needs to be completed.

We need to stay behind until late into the night to complete all the work that needs to be completed and to prepare all the ingredients for the next day or weeks.

We used this freezer for storing meat.

We need to come in a little bit earlier before the opening time.

We need to leave a little later than the closing time.

Did I phrase the above sentences correctly? Please advise.

[Torsten]

@St8762

We need to stay back/behind until late in the night to finish up all the tasks that needs to be completed.

We have to stay behind until late at night to do all the tasks that need to be done.

@St8762

We need to stay behind until late into the night to complete all the work that needs to be completed and to prepare all the ingredients for the next day or weeks.

We have to stay late into the night to do all the work that needs to be done and prepare all the ingredients for the next days or weeks.

@St8762

We used this freezer for storing meat.

We have used this freezer for meat storage.

@St8762

We need to come in a little bit earlier before the opening time.

We need to come a little early before opening hours.

@St8762

We need to leave a little later than the closing time.

We have to leave a little later than the closing time.