Release the button when the Samsung logo appears but keep holding Home + Volume Up until the TWRP recovery screen is visible. Next Steps
Always download from trusted sources (especially XDA-recognized developers). A malicious .tar.md5 file could contain a recovery that wipes your EFS partition (IMEI data) or installs malware. t110.twrp.2.7.0.1.tar.md5
Connect the tablet to the PC, load the .tar.md5 file into the AP (or PDA) slot in Odin, and click "Start". Release the button when the Samsung logo appears