Follow up with B / Check up on B ・・・
daily ([毎日](https://eikaiwa.dmm.com/uknow/questions/34286/)), weekly (週次), regularly ([次第に](https://eikaiwa.dmm.com/uknow/questions/66207/)), periodically ([定期的に](https://eikaiwa.dmm.com/uknow/questions/46626/))
Make sure B gets it done.
また「it」の代わりに・・・
Make sure B gets the report done!
丁寧に依頼したいとき、PLEASEを文頭に。
Please make sure B gets the report done ASAP (できるだけ早く)