is it ok to read from an excel file and write to same excel file?

[ayush_mishra]

I am reading from an excel file and writing the output to the same file. My workflow is working fine however I am concerned if below is the correct method for doing so. Does Alteryx firstly reads from input file completely and then writes? Or read/write happening at the same time?

[binuacs]

@ayush_mishra you need to connect the Block Until done tool just before the output tool

[ayush_mishra]

@binuacs thanks