Looking on the internet deeply has found these results:

Sorry for late reply is the most popular phrase on the web.

sorry for replying late 126,800 results on the web	Sorry for late reply 11,660,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Sorry for late reply I apologize for the late reply. No legal consequences have been drawn from that late reply. Thanks for the info and sorry for the late reply. The statistics that are collected annually and presented in the SCAC meetings, reveal a problem of late replies. Late replies occur in all Member States but their frequency varies significantly between Member States. First of all, I want to apologize for my killer late reply to this interview, hahaha. Late replies' notifications were sent in 3 out of 57 cases not answered on time which were examined by the Court.

sorry for replying late

126,800 results on the web

Sorry for late reply

11,660,000 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Sorry for late reply
I apologize for the late reply.
No legal consequences have been drawn from that late reply.
Thanks for the info and sorry for the late reply.
The statistics that are collected annually and presented in the SCAC meetings, reveal a problem of late replies.
Late replies occur in all Member States but their frequency varies significantly between Member States.
First of all, I want to apologize for my killer late reply to this interview, hahaha.
Late replies' notifications were sent in 3 out of 57 cases not answered on time which were examined by the Court.